dumb adj.

1 unable to speak

VERBS be | become, be struck They were struck dumb by some sort of shock.

PREP. with She sat there, dumb with rage.

PHRASES deaf and dumb

2 stupid

VERBS be, feel, look, seem, sound I'm sure my question sounded really dumb. | act, play I decided to act dumb.

ADV. really, very | pretty, rather

You can also check Google Dictionary: dumb (English, 中文解释 )

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