strident vs shrill

strident and shrill both are adjectives.

Word	Noun	Adjective	Verb	Adverb
strident	No	Yes	No	No
shrill	No	Yes	Yes	No

As adjectives, strident and shrill are synonyms defined as:

strident (adjective)	shrill (adjective)
unpleasantly loud and harsh	of colors that are bright and gaudy
being sharply insistent on being heard	having or emitting a high-pitched and sharp tone or tones
conspicuously and offensively loud; given to vehement outcry	being sharply insistent on being heard
of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then')

strident (verb)	shrill (verb)
	utter a shrill cry