unplumbable
Too deep to sound
Unplumbable describes depths that cannot be measured or fathomed—literally with a plumb line, figuratively with understanding.
The word appears almost exclusively in figurative contexts: the unplumbable depths of human cruelty, an unplumbable mystery.
It suggests something so profound or obscure that no effort could reach its bottom.
Immeasurably deep or obscure
- bottomlessHaving no base
- unfathomableBeyond comprehension or measurement
- abyssalExtremely deep, unmeasurable
- cavernousVast and hollow
oceanic · trench · bathyscaphe · pelagic · submarine · subterranean · chasm · abyss
Having no bounds
- boundlessWithout any boundaries
- limitlessWithout any boundaries
- immeasurableBeyond any quantification
- endlessWithout termination or boundary
measureless · incalculable · unbounded · unfathomable · cosmic · eternal · immense · inestimable
Puzzling and obscure
- inscrutableImpossible to understand
- crypticObscure in meaning
- arcaneUnderstood by few
- esotericAccessible to few
unfathomable · impenetrable · occult · sphinx · veiled · obscure · unknowable · opaque
Not awake or aware
- subconsciousBelow conscious awareness
- mindSeat of consciousness
- depthsLowest or innermost regions
- soulInnermost animating essence
psyche · repressed · hidden · inner · trauma · motives · consciousness · interiority
fathomless
Immeasurably deep or obscure
- bottomlessHaving no base
- unfathomableBeyond comprehension or measurement
- abyssalExtremely deep, unmeasurable
cavernous · oceanic · trench · bathyscaphe · pelagic · submarine · subterranean · chasm · abyss · diving
infinite
Having no bounds
- boundlessWithout any boundaries
- limitlessWithout any boundaries
- immeasurableBeyond any quantification
endless · measureless · incalculable · unbounded · unfathomable · cosmic · eternal · immense · inestimable · untold
enigmatic
Puzzling and obscure
- inscrutableImpossible to understand
- crypticObscure in meaning
- arcaneUnderstood by few
esoteric · unfathomable · impenetrable · occult · sphinx · veiled · obscure · unknowable · opaque · hermetic
unconscious
Not awake or aware
- subconsciousBelow conscious awareness
- mindSeat of consciousness
- depthsLowest or innermost regions
soul · psyche · repressed · hidden · inner · trauma · motives · consciousness · interiority · self
unplumbableshallow
Without much depth
plumbable · measurable · fathomable · finite · bounded
unplumbablefathomable
Capable of being grasped
clear · comprehensible · knowable · understandable · transparent
plumb, plumber, plumbing, plumbed, plumbable, unplumbed, plummet, aplomb