Worthy of condemnation or deserving to be cursed; extremely bad or annoying.
From 'damn' (from Latin 'damnare' meaning 'to condemn') plus '-able' (worthy of). Historically it had strong religious connotations of being condemned to hell.
The word 'damnable' appears constantly in Shakespeare's plays as a favorite insult—it had maximum impact in Elizabethan times when eternal damnation was a genuinely terrifying concept!
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