adjective (crueller, cruellest; US crueler, cruelest)
verb (cruels, cruelling, cruelled)[with object] Australian informal
- spoil or ruin (an opportunity or a chance of success):Ernie nearly cruelled the whole thing by laughing[ late 19th century: perhaps influenced by the idiom queer someone's pitch (see queer)]
Middle English: via Old French from Latin crudelis, related to crudus (see crude)
Double the l when adding endings which begin with a vowel to words which end in a vowel plus l: (crueller, cruellest).