adjective

confident, stylish, and charming (typically used of a man).

all the men looked debonair and handsome in white tie and tails

suave,urbane,sophisticated,cultured,self-possessed,self-assured,confident,charming,gracious,well mannered,civil,courteous,gallant,chivalrous,gentlemanly,refined,polished,well bred,genteel,dignified,courtly,well dressed,well groomed,well turned out,elegant,stylish,smart,dashing,dapper,spruce,trim,attractive,soigné,smooth,swish,swanky,snappy,sharp,cool,spiffy,fly,on fleek,mannerly,trig,gentle