seasonably vs apropos

seasonably is not an adjective while apropos is an adjective.

Word	Noun	Adjective	Verb	Adverb
seasonably	No	No	No	Yes
apropos	No	Yes	No	Yes

As adverbs, seasonably and apropos are synonyms defined as:

Other synonyms of seasonably include timely, well-timed.

seasonably (adjective)	apropos (adjective)
	of an appropriate or pertinent nature

seasonably (adverb)	apropos (adverb)
at an opportune time	at an opportune time
in accordance with the season	introducing a different topic