gimcrack vs trashy

gimcrack is a noun but trashy is not a noun.

Word	Noun	Adjective	Verb	Adverb
gimcrack	Yes	Yes	No	No
trashy	No	Yes	No	No

As adjectives, gimcrack and trashy are synonyms defined as:

Other synonyms of gimcrack include brassy, cheap, flash, flashy, garish, gaudy, loud, meretricious, tacky, tatty, tawdry.

gimcrack (noun)	trashy (noun)
ornamental objects of no great value

gimcrack (adjective)	trashy (adjective)
tastelessly showy	tastelessly showy
	cheap and inferior; of no value