Silence
noun
When you have nothing to say you sit in silence.
むごん
This is a jukugo word that uses the on'yomi readings of the kanji. You didn't learn this reading for 言 though, so here's a mnemonic to help you: Nothing cuts through silence like a gong (ごん). Once it's done gonging you really notice how silent the world around you is.
毎晩無言電話がかかってくるんです。
Every night I get a silent prank phone call.
彼は無言のまま部屋を出て行った。
He left the room without saying a word.
トーフグの社員たちは、無言で仕事をしているように見えますが、実はスラックというアプリでチャットしています。
Tofugu workers seem to work silently, but they are actually chatting on an app called Slack.