Third-person singular simple present indicative form of stun.(verb)
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Use "stuns" in a sentence
"Racial slur on sofa label stuns family Toronto Star Thanks to J and Fred"
"Top Stories Video: Plane carrying 230 lands without wheels in Poland Top Stories Video: Dorothy Rodham, mother of Hillary Clinton dies The Christian Science Monitor: Greek referendum call stuns EU."
"Whether they're leaking it in garbled or in non-garbled form, it really kind of stuns me that they'd leak it at all."