Infeasible or unfeasible?
infeasible is an adjective meaning “Not feasible”; unfeasible is an adjective meaning “Infeasible: not feasible”. In written English (wordfreq, 2021 data) unfeasible is about 1.7 times as common as infeasible.
What is the difference between infeasible and unfeasible?
| infeasible | unfeasible | |
|---|---|---|
| Part of speech | adjective | adjective |
| Meaning | Not feasible | Infeasible: not feasible |
| Example | none recorded | none recorded |
| Pronunciation | not recorded | /ʌnˈfiː.zə.bəl/ [ʌnˈfiː.zə.bɫ̩] /ʌnˈfi.zə.bəl/ |
| In writing | about once in every 5 million words | about once in every 3 million words |
Sources: infeasible and unfeasible in the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Every current meaning of infeasible and unfeasible
infeasible
- 1
Not feasible
unfeasible
- 1
Infeasible: not feasible
Source: the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); obsolete, archaic, dialect and rare senses left out.
Which is more common, infeasible or unfeasible?
infeasible appears about once in every 5 million words; unfeasible about once in every 3 million words.
infeasible about once in every 5 million wordsunfeasible about once in every 3 million words
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How many people search infeasible vs unfeasible?
“infeasible vs unfeasible” is searched about 480 times a month on Google and 120 on Bing in the United States. Google counts close variants of a query together (“unfeasible vs infeasible”, “infeasible or unfeasible”).
Sources: Google Ads keyword data through DataForSEO and Microsoft Advertising keyword data through DataForSEO, the average month from September 2025 to August 2026.