Synonyms for unfathomable
- adjective
Synonyms by meaning
Adjective
1. Incomprehensible — impossible to fathom. Impossible to grasp the extent of, or to fully know or understand
incomprehensible, fathomless, inscrutable, mysterious, inexplicable, deep, unknowable, bottomless, infinite, impenetrable, obscure, undecipherable, unintelligible, ungraspable, incognizable, incognisable UK, undiscoverable, unexplainable, profound, enigmatic, cryptic
2. Immeasurable — impossible to fathom. Especially of depth, physically incapable of being measured; immeasurable
immeasurable, incalculable, soundless, inestimable, unsoundable, unplumbable, abyssal dated
Other
abysmal, un-unravelable rare
Definitions
- adj. 1
Impossible to fathom. Especially of depth: physically incapable of being measured; immeasurable.
- adj. 2
Impossible to fathom. Impossible to grasp the extent of, or to fully know or understand.
The sheer number of warriors the enemy attacked with was unfathomable.
Related words
- Word family
- unfathomed
Example sentences
- mysterious A mysterious spaceship was flying away from Earth.
- incomprehensible This language is incomprehensible to me when spoken.
- inscrutable She looked at him with an inscrutable expression.
- immeasurable Queen bees have an immeasurable amount of offspring.
- incalculable The losses are incalculable.
Popularity over time
| Word | 1850 → 2019 | Trend |
|---|---|---|
| unfathomable | rising | |
| mysterious | rising | |
| incomprehensible | rising | |
| inscrutable | rising | |
| fathomless | rising | |
| immeasurable | steady |
Use in printed books, per decade from 1850 to 2019.
By length
- 4 letters
- deep1
- 7 letters
- obscure2, cryptic2, abysmal3, abyssal
- 8 letters
- infinite3, profound2
- 9 letters
- enigmatic4, soundless
- 10 letters
- mysterious4, bottomless3, unknowable4, fathomless
- 11 letters
- inscrutable4, inestimable, ungraspable, unsoundable, unplumbable
- 12 letters
- inexplicable5, impenetrable5, immeasurable5, incalculable5, incognizable, incognisable
- 13 letters
- unexplainable5
- 14 letters
- unintelligible6, undecipherable, undiscoverable
The small number after each word is its number of syllables (obscure2 = 2 syllables).
In other languages
- Français
- insondable
- Español
- insondable