Imperceptible

Imˊper-cep′ti-ble

,

Adj.

[Pref.

im-

not +

perceptible

: cf. F.

imperceptible

.]

Not perceptible; not to be apprehended or cognized by the senses; not discernible by the mind; not easily apprehended.

Almost

imperceptible

to the touch.

Dryden.

–

Imˊper-cep′ti-ble-ness

,

Noun.

–

Imˊper-cep′ti-bly

,

adv.

Their . . . subtilty and

imperceptibleness

.

Sir M. Hale.

Imperceptible

IMPERCEP'TIBLE

, a.

1.

Not to be perceived; not to be known or discovered by the senses. We say a thing is imperceptible to the touch, to the eye or sight, to the ear, to the taste or smell. Hence,

2.

Very small; fine; minute in dimensions; or very slow in motion or progress; as, the growth of a plant or animal is imperceptible; it is too slow to be perceived by the eye.

IMPERCEP'TIBLE

,

Noun.

That which cannot be perceived by the senses on account of its smallness. [Little used.]

imperceptible

English

Adjective

imperceptible ‎(comparative more imperceptible, superlative most imperceptible)

Not perceptible, not detectable, too small in magnitude to be observed.
We all missed the imperceptible shake of his head as he tried to warn us without being seen.‎