insidioso

adj

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

The verdict

“insidioso” is uncommon Portuguese (frequency #90,148 among 1,526 “I” headwords), classed as an adjective. The kind of spelling people second-guess.

#90,148
frequency rank, Portuguese
1,526
“I” headwords

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - que contém insídia; que age de modo ardiloso, traiçoeiro ou enganador

Key facts for insidioso
PropertyValue
Headwordinsidioso
LanguagePortuguese
Part of speechAdjective
Letters9
Frequency rank#90,148
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “insidioso” sits in Portuguese frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). insidioso lands here:

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

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Rare enough to double-check

insidioso is uncommon Portuguese at frequency #90,148 among 1,526 “I” headwords, classed as anadjective. Rarity is why readers land here mid-draft. 3 senses are on record.

insidioso doesn't appear in our generated misspelling index, a sign its spelling follows regular Portuguese conventions. No confusable counterpart is on file for this word, which typically means the spelling is too distinctive to be mistaken for another word.

This headword's origin isn't recorded in our source data, so its spelling is best explained by sound-to-letter mapping rather than etymology. The correct Portuguese form is insidioso, spelled I-N-S-I-D-I-O-S-O.

Definition

  1. 1
    que contém insídia; que age de modo ardiloso, traiçoeiro ou enganador
  2. 2
    que se desenvolve de forma gradual e difícil de perceber; sorrateiro; de evolução lenta e muitas vezes assintomática
  3. 3
    que aparenta ser inofensivo, mas encerra efeito pernicioso ou intenção dissimulada

Synonyms

traiçoeiroardilosopérfidoenganadorsorrateirodissimuladocapciosopernicioso

Antonyms

francodiretoexplícitolealhonestoaberto

This word in other languages

insidious(English)insidioso(Español)insidieux(Français)

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 Portuguese corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "insidioso"?
"insidioso" is spelled I-N-S-I-D-I-O-S-O.
What does "insidioso" mean?
As an adjective, "insidioso" means: que contém insídia; que age de modo ardiloso, traiçoeiro ou enganador
What language does "insidioso" come from?
"insidioso" is a Portuguese word. PlainSpell covers definitions, pronunciations, and spelling data across English, Spanish, Portuguese, French, and German.
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.

Using “insidioso”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct Portuguese spelling is I-N-S-I-D-I-O-S-O - every other letter order is a misspelling in standard orthography.
  • Browse more Portuguese words and confusable pairs in the same reference. Portuguese words

Other uncommon Portuguese words near this rank

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

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

Source: FrequencyWords open word-frequency list