From Longman Dictionary of Contemporary Englishmaniacalma‧ni‧a‧cal /məˈnaɪəkəl/ adjective CRAZYbehaving as if you are crazy —maniacally /-kli/ adverb
Examples from the Corpus
maniacal• And who created the cruel, the deluded, the maniacal?• They believe that the end of the world is about to come, and their conviction gives them a certain maniacal courage.• She was a meticulous, but not maniacal, housekeeper.• I have never hated hyenas: their occasional maniacal laughter and their eerie whooping cries are among my earliest memories.• maniacal laughter• Opposite the flower market he stepped into the maniacal Le Loi traffic, attempting languor and unconcern.• Beside him appeared the maniacal little knife-man, Miguelito, giggling like an over-excited schoolgirl at a birthday party.• It was nearly 20 years before Cade's discovery was reinvestigated and found to be a useful treatment for maniacal patients.• Mix drove it at maniacal speeds, sober or not. 