Antonyms of adv imperceptibly

1 sense of imperceptibly

Sense 1
imperceptibly, unnoticeably -- (in an imperceptible manner or to an imperceptible degree; "the power of the Secretary of State in London increased gradually but imperceptibly")
       Antonym of perceptibly (Sense 1)
      => perceptibly, noticeably, observably -- (in a noticeable manner; "he changed noticeably over the years")

Synonyms of adv imperceptibly

1 sense of imperceptibly

Sense 1
imperceptibly, unnoticeably -- (in an imperceptible manner or to an imperceptible degree; "the power of the Secretary of State in London increased gradually but imperceptibly")