unknowable
/ʌnˈnoʊ.ə.bəl/adjective, noun
unknowable is spelled U-N-K-N-O-W-A-B-L-E: 10 letters and 4 syllables. It appears about once in every 2 million words in written English, the 43,663rd most frequent word form (wordfreq, 2021 data). As an adjective, unknowable means “Not knowable; not able to be known” (English Wiktionary, September 2026).
How many letters and syllables are in unknowable?
| Letters | 10: U-N-K-N-O-W-A-B-L-E |
|---|---|
| Syllables | 4 (from its American pronunciation) |
| In writing | about once in every 2 million words; the 43,663rd most frequent word form |
| Wrong spellings searched | none measured in search |
| Rhymes with |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is unknowable?
Unknowable appears about once in every 2 million words in written English, the 43,663rd most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce unknowable?
- US /ʌnˈnoʊ.ə.bəl/
Unknowable has 4 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What rhymes with unknowable?
One word on PlainSpell end in the same sounds as unknowable from its last stressed vowel (/oʊəbəl/):
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of unknowable
- more unknowable comparative
- most unknowable superlative
- unknowables plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does unknowable mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Not knowable; not able to be known.
noun
- 1
Something that cannot be known.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Unknowable in Spanish, French, German and Portuguese
In the sense not able to be known:
| Language | Words |
|---|---|
| Spanish | incognoscible |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does unknowable come from?
From un- + knowable.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).