Strident
WordNet
adjective
(1) Unpleasantly loud and harsh
(2) Being sharply insistent on being heard
"Strident demands"
"Shrill criticism"
(3) Of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then')
(4) Conspicuously and offensively loud; given to vehement outcry
"Blatant radios"
"A clamorous uproar"
"Strident demands"
"A vociferous mob"