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.
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