adj.

1. Impossible or difficult to perceive by the mind or senses: an imperceptible drop in temperature.
2. So subtle, slight, or gradual as to be barely perceptible: an imperceptible nod.

imperceptibility im'per·cep'ti·bil'i·ty or im'per·cep'ti·ble·ness n.
imperceptibly im'per·cep'ti·bly adv.

adjective

1. Incapable of being apprehended by the mind or the senses: impalpable, imponderable, inappreciable, indiscernible, indistinguishable, insensible, intangible, invisible, unnoticeable, unobservable. See knowledge/ignorance.
2. So minute as not to be discernible: infinitesimal, microscopic. See big/small/amount.

adj

Definition: hard to sense; faint
Antonyms: apparent, conspicuous, distinct, evident, noticeable, obvious, perceptible, seeable, striking, unobscured

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IN BRIEF: adj. - Impossible or difficult to perceive by the mind or senses.

Tutor's tip: This word was used in the 2006 Scripps National Spelling Bee finals.

Dansk (Danish)
adj. - umærkelig, usynlig, uhørlig, som ikke kan mærkes/ses/høres

Nederlands (Dutch)
niet/nauwelijks waarneembaar

Français (French)
adj. - imperceptible

Deutsch (German)
adj. - nicht wahrnehmbar, unmerklich, winzig klein

Ελληνική (Greek)
adj. - αδιόρατος, ανεπαίσθητος

Italiano (Italian)
impercettibile

Português (Portuguese)
adj. - imperceptível

Русский (Russian)
незначительный, незаметный

Español (Spanish)
adj. - imperceptible

Svenska (Swedish)
adj. - oförnimbar, omärkbar

中文（简体） (Chinese (Simplified))
不能感知的, 微细的, 不知不觉的

中文（繁體） (Chinese (Traditional))
adj. - 不能感知的, 微細的, 不知不覺的

한국어 (Korean)
adj. - 감지할 수 없는, 미세한

日本語 (Japanese)
adj. - 目に見えない, 微細な

العربيه (Arabic)
‏(صفه) غير مدرك بالحس‏

עברית (Hebrew)
adj. - ‮לא-מורגש, לא ניכר‬

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