speak confidentially (verb) whisper: speak softly
Sinonime: breathe,
buzz*,
confide,
gossip,
hint, hiss,
insinuate,
intimate, mumble,
murmur,
mutter, say softly, say under one's breath, sibilate,
sigh, speak confidentially, spread rumor, susurrate, talk into someone's ear, talk low,
tell, tell a secret
Antonime: shout