astounded, at a loss for words, bowled over (informal) dazed, devastated, dumbfounded, flabbergasted (informal) gobsmacked (Brit. slang) numb, shocked, staggered, struck dumb
English Collins Dictionary - English synonyms & Thesaurus
stun ( stuns 3rd person present) ( stunning present participle) ( stunned past tense & past participle )
1 verb If you are stunned by something, you are extremely shocked or surprised by it and are therefore unable to speak or do anything.
Many cinema-goers were stunned by the film's violent and tragic end. be V-ed
When they told me she had gone missing I was totally stunned...
2 verb If something such as a blow on the head stuns you, it makes you unconscious or confused and unsteady.
Sam stood his ground and got a blow that stunned him. V n
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