Antonyms of adv visibly

1 of 2 senses of visibly

Sense 1
visibly -- (in a visible manner; "he was visibly upset")
       Antonym of invisibly (Sense 1)
      => invisibly -- (without being seen; "these organisms enter the body invisibly")

Synonyms of adv visibly

2 senses of visibly

Sense 1
visibly -- (in a visible manner; "he was visibly upset")

Sense 2
visibly -- (so as to be visible; "the sign was visibly displayed")