"mutest" in the adjective sense
1. mute, tongueless, unspoken, wordless
expressed without speech
"a mute appeal"
"a silent curse"
"best grief is tongueless"- Emily Dickinson
"the words stopped at her lips unsounded"
"unspoken grief"
"choking exasperation and wordless shame"- Thomas Wolfe
2. dumb, mute, silent
unable to speak because of hereditary deafness
Source: WordNet® (An amazing lexical database of English)
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