apropos

adjectives

of an appropriate or pertinent nature
apropos
antonym
malapropos
is similar to
being of striking appropriateness and pertinence
"the successful copywriter is a master of apposite and evocative verbal images"; "an apt reply"
apposite, apt, pertinent
see also
suitable for a particular person or place or condition etc
"a book not appropriate for children"; "a funeral conducted the appropriate solemnity"; "it seems that an apology is appropriate"
appropriate
is an attribute of
the quality of being specially suitable
appropriateness

adverbs

at an opportune time
"your letter arrived apropos"
apropos, seasonably, timely, well-timed
introducing a different topic; in point of fact
"incidentally, I won't go to the party"
apropos, by the bye, by the way, incidentally