adj. 25B6; adjective
have a nice time : ENJOYABLE, pleasant, agreeable, good, satisfying, gratifying, delightful, marvellous; entertaining, amusing, diverting; informal lovely, great; N. Amer. informal neat.
nice people : PLEASANT, likeable, agreeable, personable, congenial, amiable, affable, genial, friendly, charming, delightful, engaging; sympathetic, compassionate, good.
nice manners : POLITE, courteous, civil, refined, polished, genteel, elegant.
that's a rather nice distinction : SUBTLE, fine, delicate, minute, precise, strict, close; careful, meticulous, scrupulous.
it's a nice day : FINE, pleasant, agreeable; dry, sunny, warm, mild.
unpleasant, nasty, rough.