Antonyms of adj gabby

1 sense of gabby

Sense 1
chatty, gabby, garrulous, loquacious, talkative, talky -- (full of trivial conversation; "kept from her housework by gabby neighbors")

INDIRECT (VIA voluble) -> taciturn -- (habitually reserved and uncommunicative)

Similarity of adj gabby

1 sense of gabby

Sense 1
chatty, gabby, garrulous, loquacious, talkative, talky -- (full of trivial conversation; "kept from her housework by gabby neighbors")
       => voluble (vs. taciturn) -- (marked by a ready flow of speech; "she is an extremely voluble young woman who engages in soliloquies not conversations")