"malapropos" in the adjective sense
1. malapropos
of an inappropriate or incorrectly applied nature
"malapropos" in the adverb sense
1. inopportunely, malapropos
at an inconvenient time
"he arrived inopportunely just as we sat down for dinner"
"she answered malapropos"
Source: WordNet® (An amazing lexical database of English)
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