underbreath

Barely audible whisper

Under one's breath—quietly, in a murmur or whisper not meant to be fully heard: She muttered something underbreath.

The word usually appears in the phrase under one's breath, but underbreath works as a single adverb.

Someone speaking underbreath may be cursing, complaining, or making a comment they don't want overheard.

whisper

murmur

Soft, indistinct continuous sound

hush · soft · low · inaudible · quiet · hushed · breathe · sigh · sibilant · barely audible

secretive

confide

Share private matters

hidden · covert · hush-hush · conspiratorial · aside · between us · off-the-record · guarded · clandestine · veiled

gossip

rumor

Unconfirmed circulating story

hint · suggestion · tittle-tattle · backbiting · hearsay · aside · slander · defamation · smear · backstabbing

furtive

sneaky

Stealthily deceptive

  • stealthySecretly cautious in movement
  • slyCleverly deceptive
  • shiftySeeming dishonest or evasive

skulking · cagey · evasive · sidelong · sidewise · secretive · undetected · unnoticed · subtle · inconspicuous

disparaging

grumble

Low, discontented murmuring

  • curseInvoked harm through words
  • swearVow or use profanity
  • snideDerisively insinuating

snark · barb · jab · dig · complaint · gripe · insult · oath · expletive · profanity

Opposites
volume/audibility

underbreathshout

Loud vocal outburst

yell · scream · bellow · roar · aloud

manner of delivery

underbreathopenly

Without hiding anything

publicly · on the record · plainly · forthrightly · outspokenly

Family

under, breath, breathing, underneath, undertake, breathless, undertone, subvocalization

Familiarity
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Used worldwide · Timeless · Everyday, not technical · Rated G