suboptimal

Name: suboptimal, English Word Data
Creator: Wiktionary
License: https://creativecommons.org/licenses/by-sa/4.0/

/sʌbˈɑptɪməl/

//sʌbˈɑptɪməl// adj

By PlainSpell · According to Wiktionary data (CC BY-SA) · analyzed May 6, 2026

The verdict

“suboptimal” is uncommon English (frequency #52,656 among 54,294 “S” headwords), classed as an adjective. The kind of spelling people second-guess.

#52,656
frequency rank, English: 54,294
“S” headwords

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Worse than optimal; of less than the highest standard or quality.

Key facts for suboptimal
Property	Value
Headword	suboptimal
Language	English
Part of speech	Adjective
IPA	/sʌbˈɑptɪməl/
Letters	10
Frequency rank	#52,656
Misspellings tracked	0
Confusable pairs	0
Source	Wiktionary (kaikki.org)

Where “suboptimal” sits in English 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). suboptimal lands here:

#52,656

#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

suboptimal is uncommon English at frequency #52,656 among 54,294 “S” headwords, classed as anadjective, transcribed /sʌbˈɑptɪməl/. Rarity is why readers land here mid-draft. Gloss: "Worse than optimal; of less than the highest standard or quality.".

No generated misspelling entries exist for suboptimal in our index, since its letter pattern doesn't lend itself to common typo substitutions. We don't track a confusable pairing for this entry, since its spelling is unusual enough that it doesn't cluster with a lookalike.

Etymologically, the entry records: From sub- + optimal. The correct English form is suboptimal, spelled S-U-B-O-P-T-I-M-A-L.

Definition

1
Worse than optimal; of less than the highest standard or quality.

Etymology

From sub- + optimal.

This word in other languages

suboptimal(Français)suboptimal(Deutsch)

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 "suboptimal"?

"suboptimal" is spelled S-U-B-O-P-T-I-M-A-L. The IPA pronunciation is /sʌbˈɑptɪməl/.

What does "suboptimal" mean?

As an adjective, "suboptimal" means: Worse than optimal; of less than the highest standard or quality.

How do you pronounce "suboptimal"?

The IPA (International Phonetic Alphabet) transcription for "suboptimal" is /sʌbˈɑptɪməl/. 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 "suboptimal"?

From sub- + optimal. 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.

Using “suboptimal”

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

The one correct English spelling is S-U-B-O-P-T-I-M-A-L - every other letter order is a misspelling in standard orthography.
Say it as /sʌbˈɑptɪməl/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
Browse more English words and confusable pairs in the same reference. English words

Other uncommon English 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.