unconceivable
Cannot be fathomed
Unconceivable means impossible to imagine or comprehend—a less common variant of inconceivable.
Both words work the same way: It's unconceivable that anyone could survive such a fall.
Inconceivable dominates in modern usage, making unconceivable sound slightly archaic or emphatic.
Too terrible to contemplate
- unfathomableBeyond comprehension or measurement
- unimaginableBeyond mental conception
- incomprehensibleImpossible to understand
- ungraspableImpossible to seize
indescribable · ineffable · inexplicable · inscrutable · impenetrable · unknowable · mystifying · baffling
Causing great wonder
- staggeringShockingly impressive or unsteady
- mind-bogglingOverwhelmingly difficult to grasp
- mind-blowingOverwhelmingly impressive or shocking
- jaw-droppingExtremely surprising or impressive
breathtaking · stupefying · overwhelming · extraordinary · phenomenal · prodigious · wondrous · miraculous
Not capable of achievement
- unattainableImpossible to acquire
- unachievableCannot be accomplished
- unrealizableImpossible to achieve
- impracticableImpossible to implement
insurmountable · insuperable · unworkable · undoable · hopeless · unviable · irresolvable · out of reach
unthinkable
Too terrible to contemplate
- unfathomableBeyond comprehension or measurement
- unimaginableBeyond mental conception
- incomprehensibleImpossible to understand
ungraspable · indescribable · ineffable · inexplicable · inscrutable · impenetrable · unknowable · mystifying · baffling · perplexing
astonishing
Causing great wonder
- staggeringShockingly impressive or unsteady
- mind-bogglingOverwhelmingly difficult to grasp
- mind-blowingOverwhelmingly impressive or shocking
jaw-dropping · breathtaking · stupefying · overwhelming · extraordinary · phenomenal · prodigious · wondrous · miraculous · beyond belief
infeasible
Not capable of achievement
- unattainableImpossible to acquire
- unachievableCannot be accomplished
- unrealizableImpossible to achieve
impracticable · insurmountable · insuperable · unworkable · undoable · hopeless · unviable · irresolvable · out of reach · unforeseeable
unconceivableconceivable
Able to be imagined
thinkable · imaginable · comprehensible · fathomable · graspable
unconceivablebelievable
Able to convince
credible · plausible · possible · convincing · likely
conceivable, conceive, inconceivable, conceiving, conceived, conceiver, concept, conception, conceptual