Crossword clues for Sure, why not:SUREBy all means!SUREDeodorant brandSUREOkeydokeySURE___ as shootin'!SUREOkey-dokeSURELYWithout doubtSUREWhy the hell notSURECinchedSUREOkaySURESuffering no doubtSURECasual affirmativeSUREDismissive comment, when said a certain waySUREWhy not?SURENatchSUREIt becomes its own synonym when 'ec' is inserted after its first letterSUREI betSUREI guess ...SUREConfidentSUREWithout questionSUREDoubt-freeSUREDoubtlessSURETrustworthySUREBan rivalSUREArrid competitorSURELYWith 17-Across, skeptic's wordsSURECockySURE__-footedSUREOf courseSUREFree from doubtSUREUnfailingSUREBan alternativeSUREAbsolutely!SUREFine by me ...SUREGlad to!SUREI'm downSUREConvincedSUREDefiniteSUREYou bet!SURESee 19-AcrossSUREWithout a doubtSUREPositiveSURESign me upSUREYeah, why not?SURENo prob!SUREFree of doubtSURECertainly!SURENo problemSUREConfident (Tribute #6)SUREYeah, right!SURELYWord that may elicit the response "And don't call me Shirley"