imperceptible

adjective im·per·cep·ti·ble \ˌim-pər-ˈsep-tə-bəl\

: impossible to see or notice

Full Definition of IMPERCEPTIBLE

: not perceptible by a sense or by the mind : extremely slight, gradual, or subtle <imperceptible differences>

— im·per·cep·ti·bly \-ˈsep-tə-blē\ adverb

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Middle English, from Middle French, from Medieval Latin imperceptibilis, from Latin in- + Late Latin perceptibilis perceptible

First Known Use: 15th century

Antonyms: appreciable, discernible (also discernable), palpable, perceptible, ponderable, sensible

IMPERCEPTIBLY Defined for Kids

adjective im·per·cep·ti·ble \ˌim-pər-ˈsep-tə-bəl\

: not noticeable by the senses or by the mind : very small or gradual <imperceptible changes>

— im·per·cep·ti·bly \-blē\ adverb

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