'malapropos' definitions:

Definition of 'malapropos'

From: WordNet
adverb
At an inconvenient time; "he arrived inopportunely just as we sat down for dinner"; "she answered malapropos" [syn: inopportunely, malapropos] [ant: opportunely]
adjective
Of an inappropriate or incorrectly applied nature [ant: apropos]

Definition of 'malapropos'

From: GCIDE
  • malapropos \mal*ap"ro*pos`\, a. & adv. [F. mal [`a] propos; mal evil + [`a] propos to the purpose.] Unseasonable or unseasonably; unsuitable or unsuitably. [1913 Webster]