прилагательное незаметный, незначительный Например: imperceptible to the touch — незаметный на ощупь
adjective Etymology: Middle English, from Middle French, from Medieval Latin imperceptibilis, from Latin in- + Late Latin perceptibilis perceptible not perceptible by a sense or by the mind; extremely slight, gradual, or subtle Example: imperceptible differences • imperceptibly adverb