1(chiefly English regional). Of fruit, vegetables, etc.: mouldy, decayed, rotten; overripe; tough.
2(chiefly English regional). Confused, bewildered; out of sorts; fuddled through drinking alcohol; foolish, stupid.
3(now chiefly Newfoundland). Of the weather: close, damp, muggy; misty, foggy. Of the moon: concealed by haze, indistinct.
(now chiefly Irish English). An idiot, a fool.
Late 15th century (in an earlier sense). From moss + -y.