not talking

• silentProducing no sound
• quietLacking in sound
• muteWithout voice or sound
• speechlessUnable to talk
• hushedReduced to silence

wordless · stillness · voiceless · tight-lipped · tongue-tied · reserved · withdrawn · sulking · brooding · cold shoulder · stonewalling · awkward · uncomfortable · tension · ignoring · shunning · secretive · guarded