sly
/slaɪ/
"sly" is a 3-letter English headword indexed on PlainSpell.
The verdict
“sly” is a moderately-common English word, ranked #17,246 in English word frequency and used as an adjective.
- #17,246
- frequency rank, English
- 3
- letters
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Artfully cunning; secretly mischievous; wily.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | sly |
| Language | English |
| Part of speech | Adjective |
| IPA | /slaɪ/ |
| Letters | 3 |
| Frequency rank | #17,246 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “sly” sits in English frequency
Spelling & Dictionary Insight
The English entry for sly is 3 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /slaɪ/. Corpus data places it at rank #17,246 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 4 distinct senses for this headword, so context determines which meaning a reader should apply.
No generated misspelling entries exist for sly in our index, typically a sign the spelling maps closely to how the word sounds. It also participates in 20 confusable-pair relationships, "so", "SS", "SP", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.
Etymologically, the entry records: From Middle English sly, sley, sleigh, sleiȝ, from Old Norse slǿgr (“sly, cunning”, literally “capable of hitting or striking”), from Proto-Germanic *slōgiz (“lively, agile, cunning, sly, striking”), from Proto-Indo-European *slak- (“to hit, throw”). Cognat… The correct English form is sly, spelled S-L-Y.
Definition
- 1Artfully cunning; secretly mischievous; wily.
- 2Dexterous in performing an action, so as to escape notice
- 3Done with, and marked by, artful and dexterous secrecy; subtle
- 4Light or delicate; slight; thin.
Etymology
From Middle English sly, sley, sleigh, sleiȝ, from Old Norse slǿgr (“sly, cunning”, literally “capable of hitting or striking”), from Proto-Germanic *slōgiz (“lively, agile, cunning, sly, striking”), from Proto-Indo-European *slak- (“to hit, throw”). Cognate with Icelandic slægur (“crafty, sly”), Norwegian Nynorsk sløg (“sly”). Related to sleight, slay. In all likelihood, however, unrelated with Saterland Frisian slau (“sly, crafty”), Dutch sluw (“sly, cunning”), Low German slu (“sly, cunning”), German schlau (“clever, crafty”). Doublet of sleight and slöjd
This word in other languages
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
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Using “sly”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is S-L-Y - every other letter order is a misspelling in standard orthography.
- Say it as /slaɪ/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “so” - see the side-by-side comparison. sly vs so
- Browse more English words and confusable pairs in the same reference. English words
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.