"damning" in the verb sense
1. curse, beshrew, damn, bedamn, anathemize, anathemise, imprecate, maledict
wish harm upon invoke evil upon
"The bad witch cursed the child"
"damning" in the adjective sense
1. damnatory, damning
threatening with damnation
Source: WordNet® (An amazing lexical database of English)
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