5 Letter Words starting with ACU

• (of an unpleasant or unwelcome situation or phenomenon) present or experienced to a severe or intense degree

Synonyms: severe, critical, drastic, dire, dreadful, terrible, awful, grave, bad, serious, profound

• having or showing a perceptive understanding or insight; shrewd

Synonyms: astute, shrewd, sharp, sharp-witted, razor-sharp, rapier-like, quick, quick-witted, agile, nimble, ingenious, clever, intelligent, bright, brilliant, smart, canny, intuitive, discerning, perceptive, perspicacious, penetrating, insightful, incisive, piercing, discriminating, sagacious, wise, judicious

• (of an angle) less than 90°

• (of a sound) high; shrill

Synonyms: high, high-frequency, soprano, treble, falsetto, shrill, acute, sharp, piping, piercing, penetrating