adjective, mardier, mardiest.
grumpy or moody; sulky: She's behaving like a typical mardy teenager, refusing to tell us what's wrong.
a grumpy mood; a sulk: He's a good old chap, but he sometimes comes home in a mardy after stopping at the pub.
< British dialect mard
‘spoiled; spoiled child’ (alteration of marred,
past tense of mar
) + -y1