1. 哑：mutely 无言地 | muteness 哑 | mutex 互斥

2. 失语：24.Deafness-失聪. | 25.Muteness-失语. | 26.Anaesthesia-麻醉.

noun

1. a refusal to speak when expected

e.g. his silence about my contribution was surprising

Synonym: silence

2. the condition of being unable or unwilling to speak

e.g. her muteness was a consequence of her deafness

Synonym: mutism