Antonyms of adj blabbermouthed

2 senses of blabbermouthed

Sense 1
bigmouthed, blabbermouthed, blabby, talkative -- (unwisely talking too much)

INDIRECT (VIA indiscreet) -> discreet -- (marked by prudence or modesty and wise self-restraint; "his trusted discreet aide"; "a discreet, finely wrought gold necklace")

Sense 2
blabbermouthed, leaky, talebearing (prenominal), tattling (prenominal) -- (prone to communicate confidential information)

INDIRECT (VIA communicative) -> uncommunicative, incommunicative -- (not inclined to talk or give information or express opinions)

Similarity of adj blabbermouthed

2 senses of blabbermouthed

Sense 1
bigmouthed, blabbermouthed, blabby, talkative -- (unwisely talking too much)
       => indiscreet (vs. discreet) -- (lacking discretion; injudicious; "her behavior was indiscreet at the very best")

Sense 2
blabbermouthed, leaky, talebearing (prenominal), tattling (prenominal) -- (prone to communicate confidential information)
       => communicative (vs. uncommunicative), communicatory -- (able or tending to communicate; "was a communicative person and quickly told all she knew"- W.M.Thackeray)