flavourless vs vapid

flavourless and vapid both are adjectives.

Word	Noun	Adjective	Verb	Adverb
flavourless	No	Yes	No	No
vapid	No	Yes	No	No

As adjectives, flavourless and vapid are synonyms defined as:

Other synonyms of flavourless include bland, flat, flavorless, insipid, savorless, savourless.

flavourless (adjective)	vapid (adjective)
lacking taste or flavor or tang	lacking taste or flavor or tang
	lacking significance or liveliness or spirit or zest