mountainous

/ˈmaʊn.tɪ.nəs/

//ˈmaʊn.tɪ.nəs// adj

By · According to Wiktionary data (CC BY-SA) ·

"mountainous" is a 11-letter English headword indexed on PlainSpell.

The verdict

“mountainous” has 15 generated spelling variants in the English index at frequency #17,681. The variants make it a useful spelling check.

#17,681
frequency rank, English
4,057
“M” headwords
15
tracked misspellings
1
confusable pair

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Having many mountains; characterized by mountains; of the nature of a mountain; rough (terrain); rocky.

Corpus desk

Index EN-mountainous · mountainous · English

mountainous · rank #17,681 · 15 variants · 1 confusable

  • FREQ-MID #17,681
  • LEN-MEGA 11 letters
  • VOW-6 6 vowels
  • CONFUS-LOW 1 pairs
  • VAR-HIGH 15 variants
  • BOOK-MID 4,057
  • PHOTO-FINISH NDP

Nearest frequency peer: NDP (+1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “mountainous”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “mountainous” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

mountainous vs mountains
82% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for mountainous
PropertyValue
Headwordmountainous
LanguageEnglish
Part of speechAdjective
IPA/ˈmaʊn.tɪ.nəs/
Letters11
Frequency rank#17,681
Misspellings tracked15
Confusable pairs1
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “mountainous”

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).mountainouslands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “NDP” (#17,682), “Mondays” (#17,679), “nearer” (#17,683). Among 4,057 “M” headwords, “mountainous” is #17,681. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 15 spelling variants around mountainous (IPA /ˈmaʊn.tɪ.nəs/), anadjective. Corpus frequency is #17,681 among 4,057 “M” headwords. Wiktionary lists 4 senses, so context still picks the gloss.

Our generated misspelling index lists 15 likely wrong-spelling variants for mountainous, with forms such as "mmountainous", "monutainous", and "mounatinous". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 1 confusable-pair relationship, "mountains", since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: From mountain + -ous after Middle French montagneux, from Late Latin montāniōsus, from montānia, from Latin montem (“mountain”). The correct English form is mountainous, spelled M-O-U-N-T-A-I-N-O-U-S.

Definition

  1. 1
    Having many mountains; characterized by mountains; of the nature of a mountain; rough (terrain); rocky.
  2. 2
    Resembling a mountain, especially in size; huge; towering.
  3. 3
    Very difficult.
  4. 4
    Inhabiting mountains; hence, barbarous.

Recorded use

Wiktionary examples

These source excerpts show how mountainous appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. [Water vapour bubbles] hit againſt the ſides of the more eminent and Mountainous Places, of the Globe, and by this Concuſſion are condenſed, and thus become heavier than the Air they ſvvom in, and ſo gleet dovvn the rocky Caverns of theſe Mountains, […]
  2. The mountainous nature of Norway has always been a serious obstacle to the development of railways, and although some 2,700 route miles are now open for traffic, several schemes have yet to be completed.

Etymology

From mountain + -ous after Middle French montagneux, from Late Latin montāniōsus, from montānia, from Latin montem (“mountain”).

This word in other languages

montañoso(Español)montagneux(Français)bergig(Deutsch)montanhoso(Português)

Common misspellings

Also misspelled as:

  • mmountainous
  • monutainous
  • mounatinous
  • mounntainous
  • mountainnous
  • mountainosu
  • mountainouss
  • mountainuos
  • mountaionus
  • mountanious
  • mountianous
  • mounttainous
  • moutnainous
  • muontainous
  • omuntainous

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of mountainous - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

mmountainous1monutainous2mounatinous2mounntainous1mountainnous1mountainosu2mountainouss1mountainuos2
Edit distance from "mountainous"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "mountainous"?
"mountainous" is spelled M-O-U-N-T-A-I-N-O-U-S. The IPA pronunciation is /ˈmaʊn.tɪ.nəs/.
What does "mountainous" mean?
As an adjective, "mountainous" means: Having many mountains; characterized by mountains; of the nature of a mountain; rough (terrain); rocky.
What words are commonly confused with "mountainous"?
"mountainous" is commonly confused with "mountains". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "mountainous"?
The IPA (International Phonetic Alphabet) transcription for "mountainous" is /ˈmaʊn.tɪ.nəs/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "mountainous"?
From mountain + -ous after Middle French montagneux, from Late Latin montāniōsus, from montānia, from Latin montem (“mountain”). See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "mountainous", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 11 letters (nearest by frequency rank).

misdemeanor#17,677retribution#17,703incremental#17,639imperialism#17,637

Similar misspelling depth

Headwords with a similar count of attested misspellings (15 here; floor ≥5).

misfortune15 variantsmanageable15 variantsrhetorical15 variantsdownright15 variants

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list