IPA: /ˈvɔɪsləsli/
KK: /ˈvɔɪsləsli/
In a way that does not involve sound or voice.
She expressed her feelings voicelessly, using only gestures and facial expressions.
Voicelessly → It is formed from "voice" (from Latin "vox", meaning sound or speech) and the suffix "-less" (meaning without) combined with the adverbial suffix "-ly" (meaning in a manner). The word "voicelessly" means in a manner that is without sound or speech.
Think of 'voice' as the sound we make when we speak, and 'less' means without. So, when something is done 'voicelessly', it is done without any sound.