intelligent,
bright, brainy (informal), quick, clever, sharp
antonym: stupid
keen,
clever, shrewd, nifty, canny, cool, smooth
insolent,
rude, facetious, clever, disrespectful, impertinent (formal), sarcastic
elegant,
neat, tidy, stylish, chic, well-dressed, well-groomed, well-turned-out, dapper,
dashing
antonym: shabby
fashionable,
trendy (informal), chic, glamorous, hip (slang), stylish, voguish, glitzy, ritzy
(informal), swanky (informal), elegant
lively,
brisk, vigorous, energetic, quick, rapid, speedy