Headcases

Part of speech: noun

Definitions

1. People whose behaviour is erratic, irrational, or unpredictable, often regarded as mentally unbalanced or unstable
2. Individuals considered emotionally disturbed, eccentric, or wildly unpredictable in the way they think and act
3. Persons labelled as mad, unhinged, or psychologically troubled, typically used informally to describe odd or volatile people

Etymology: "Headcase" is a compound of "head" and "case," and the second half is the more interesting one. "Head" comes from Old English "hēafod," tracing back through Proto-Germanic to the same ancient root as Latin "caput," which is why it is a close cousin of words like "capital" and "chief." The "case" half is less certain: the historical link to the familiar sense of a "case" (a box or container, or a legal matter) is ambiguous, so it is best understood simply as a noun of its own kind here rather than as a settled borrowing. The compound describes a person thought of as a "case" in the head, meaning someone whose mind is considered disordered or unhinged. Its sense has stayed close to informal, slightly derisive speech, usually applied to someone who seems mentally unstable or eccentric rather than to anyone with a formal diagnosis.

Synonyms: nutcase, crackpot, lunatic