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ma·ni·a·cal

maniacal

pronunciation:
m naI kl
part of speech: adjective
definition: marked by wildness, craziness, and violence.
The patient's maniacal stare terrified the nurse and she called for assistance.
synonyms:
amok, berserk, frenzied, insane, maniac, raving, wild
similar words:
crazy, demented, deranged, frantic, furious, mad, psycho, rabid, violent
derivation: maniacally (adv.)