Phrase guide

mad as a March hare

adj · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

adj

Meaning 1

Crazy, demented.

Definition source: English Wiktionary via Wiktextract

Usage: informal, not-comparable

Qualifier: simile

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: mad as a hatter, 5150, bananas, barking, barking mad, buggish, buggy, bughouse, barmy, batchy, batpoop, bats, batty, bonkers, bread baskets, cracked, crackers, cra-cra, cray, cray-cray, crazed, crazy, crazy as a bedbug, crazy as a cootie, crazy as a cootie bug, crazy as a pet coon, cuckoo, daffy, daft, demented, deranged, distraught, disturbed, doolally, dotty, eccentric, fruit loops, gaga, hatstand, harebrained, insane, kooky, loon, loco, loony, loony tunes, loopy, lunatic, mad, mental, mentally ill, meshigener, meshugge, moonsick, nerts, non compos mentis, nonsane, nucking futs, nut job, nutballs, nut, nuts, nutso, nutty, nutter, off the beam, off the chain, over the edge, potty, psycho, psychoceramic, psychotic, sicko, screwy, squirrelly, starkers, tonto, unbalanced, unsane, wackadoodle, weird, whackjob, whacko, whacky, wode, yampy, zany, apeshit, batcrap, batshit, bat-shit, fucked in the head, fucked up, ripshit

Antonyms: none provided

History

Etymology

Possibly from the boisterous behaviour of hares in their breeding season.