grotty · adjective1
Clipping of grotesque + -y. Piecewise doublet of grody, the American equivalent. Compare Middle English groti, grooti (“slimy, muddy”), from Old English grotiġ (“earthy, dirty”) (modern dialectal English groaty, Scots grotty), which is equivalent to groat + -y. Compare also Scottish Gaelic grod (“rotten, lousy, terrible”), Middle Irish grot (“bitter, sour”). Originated or popularised by the 1964 film A Hard Day's Night, starring the Beatles and written by Alun Owen.
grotty · adjective2
See groaty.
Etymology from Wiktionary, CC BY-SA 4.0.