A mentally ill or unstable person.
More example sentences
- Stop being such an emotional headcase, she mentally scolded herself.
- I refuse to accept that it can be statistically possible for the Conservative Party in the country to contain a higher percentage of headcases.
- The producers seem to take the most fragile of headcases from our TV slots and ram them into a house stuffed with other fragile headcases.
madman/madwoman, maniac, lunatic
informal loony, nut, nutcase, nutjob, nutter, fruitcake, cuckoo, basket case, headbanger, schizo, crank, crackpot, oddball, weirdo, weirdie, sicko
British informal odd bod
Scottish informal radge
North American & Australian/New Zealand informal dingbat
informal , dated case
Definition of headcase in:
- The US English dictionary