adjective sulkier sulk′i·er, sulkiest sulk′i·est

1. showing resentment or dissatisfaction by petulant or peevish withdrawal
2. gloomy; dismal; sullen a sulky day

Etymology: prob. < OE -solcen (in comp.), idle, sluggish, pp. of -seolcan, to become slack < IE base *selĝ-, to let go, let loose > Sans sarjati, (he) releases

noun pl. sulkies sulk′·ies

Etymology: prob. < sulkythe , in the sense of keeping aloof, because the vehicle seats only one person