Antonyms of adj loud-mouthed

1 sense of loud-mouthed

Sense 1
loud-mouthed -- (given to loud offensive talk)

INDIRECT (VIA loud) -> soft -- ((of sound) relatively low in volume; "soft voices"; "soft music")

Similarity of adj loud-mouthed

1 sense of loud-mouthed

Sense 1
loud-mouthed -- (given to loud offensive talk)
       => loud (vs. soft) -- (characterized by or producing sound of great volume or intensity; "a group of loud children"; "loud thunder"; "her voice was too loud"; "loud trombones")