Synonyms for impossible
- adjective
Most common
inconceivable unthinkable unimaginable unfeasible impracticable
Synonyms by meaning
Adjective
1. Inconceivable
2. Unfeasible
unfeasible, impracticable, unachievable, unattainable, hopeless, infeasible, unworkable, intolerable, unacceptable, unrealizable rare, unrealisable UK
Other
unpossible dated rare, nonpossible rare, unhappenable rare
Definitions
- adj. 1
Not possible; not able to be done or happen.
It is difficult, if not impossible, to memorize 20,000 consecutive numbers.
- adj. 2
Very difficult to deal with.
This humidity is impossible.
Related words
Choose the right word
A thing is impracticable when it can not be accomplished by any human means at present possessed; a thing is impossible when the laws of nature forbid it. The navigation of a river may now be impracticable, but not impossible, because the existing obstructions may yet be removed.
Webster's Revised Unabridged Dictionary (1913)
Example sentences
- unfeasible This plan is not just unfeasible, but impossible.
- impracticable At one time it was thought impracticable for man to fly.
Popularity over time
| Word | 1850 → 2019 | Trend |
|---|---|---|
| impossible | steady | |
| unfeasible | falling | |
| impracticable | falling |
Use in printed books, per decade from 1850 to 2019.
By length
- 8 letters
- hopeless2
- 10 letters
- unworkable4, unfeasible4, infeasible4, unpossible
- 11 letters
- unthinkable4, intolerable5, nonpossible
- 12 letters
- unacceptable5, unimaginable6, unattainable5, unachievable, unrealizable, unrealisable, unhappenable
- 13 letters
- inconceivable5, impracticable5
The small number after each word is its number of syllables (hopeless2 = 2 syllables).
In other languages
- Français
- impossible
- Italiano
- impossibile
- Español
- imposible
- Deutsch
- unmöglich
- Català
- impossible