unperceivable
Cannot be sensed
Unperceivable means impossible to perceive or detect—beyond the reach of the senses or awareness.
The change was so gradual as to be unperceivable.
The word emphasizes absolute invisibility to observation, stronger than merely unnoticed or overlooked.
Interchangeable with imperceptible, though less common.
Too small for eyes
- infinitesimalQuantity approaching zero
- subatomicSmaller than atoms
- quantumSmallest discrete unit
- nanoMetric prefix for billionth
atomic · minute · indiscernible · inappreciable · negligible · undetectable · unobservable · insensible
Passing very quickly
- transientTemporary, soon departing
- momentaryLasting very briefly
- evanescentTending to vanish quickly
- passingMoving by or temporary
brief · instantaneous · vanishing · quick · short-lived · fugitive · elusive · split-second
Beyond the material realm
- conceptualOf or relating to ideas
- theoreticalBased on hypothesis, untested
- philosophicalConcerned with fundamental truths
- intangibleNot physically present
immaterial · nonphysical · transcendent · ineffable · incorporeal · ideational · notional · ethereal
microscopic
Too small for eyes
- infinitesimalQuantity approaching zero
- subatomicSmaller than atoms
- quantumSmallest discrete unit
nano · atomic · minute · indiscernible · inappreciable · negligible · undetectable · unobservable · insensible · undiscernible
fleeting
Passing very quickly
- transientTemporary, soon departing
- momentaryLasting very briefly
- evanescentTending to vanish quickly
passing · brief · instantaneous · vanishing · quick · short-lived · fugitive · elusive · split-second · flashing
metaphysical
Beyond the material realm
- conceptualOf or relating to ideas
- theoreticalBased on hypothesis, untested
- philosophicalConcerned with fundamental truths
intangible · immaterial · nonphysical · transcendent · ineffable · incorporeal · ideational · notional · ethereal · unknowable
concealed
Made invisible deliberately
shrouded · cloaked · camouflaged · covert · secreted · occluded · buried · latent · undiscovered · unseen
unperceivableperceivable
Able to be sensed
perceptible · detectable · discernible · observable · noticeable
perception, perceive, perceptive, perceptible, imperceptible, imperceptibly, perceptual, unperceived, perceivable