going beyond what is usual or ordinary; excessive; extreme.

an extremist, as in politics, religion, fashion, etc.

( initial capital letter ) Military . the British code name for intelligence gathered by decrypting German wireless communications enciphered on the Enigma machine during World War II.

adjective

middle , moderate

adjective

all out , drastic , excessive , extremist , fanatical , far-out * , gone * , immoderate , outlandish , out of bounds , outr , rabid * , radical , revolutionary , too much * , fanatic , rabid , beyond , extravagant , extreme , forward , ultimate

noun

fanatic , radical , revolutionary , revolutionist , zealot