1. (v. i.) Acute; sharp; piercing; having or emitting a sharp, piercing tone or sound; -- said of a sound, or of that which produces a sound.

2. (n.) A shrill sound.

3. (v. i.) To utter an acute, piercing sound; to sound with a sharp, shrill tone; to become shrill.

4. (v. t.) To utter or express in a shrill tone; to cause to make a shrill sound.

absonant acute argute atonal cacophonous caterwaul cracked creak creaky diaphonic disconsonant discordant disharmonic disharmonious dissonant ear-piercing ear-splitting flat grating harsh high high-pitched howl howling immelodious inharmonic inharmonious keen keening musicless nonmelodious off off-key off-tone out of pitch out of tone out of tune penetrating piercing pipe piping raucous reedy screak screaky scream screech screeching screechy sharp shriek shrieking shrieky skirl skreigh sour squawk squeak squeaking squeaky squeal strident thin treble tuneless ululant ululation unharmonious unmelodious unmusical untunable untuned untuneful wail wailing whine whining whistle whistling yammer