愉しい[tanoshii] enjoyable
愉しみ[tanoshimi] enjoyment
不愉快[fuyukai] discomfort
愉快[yukai] pleasant
愉楽[yuraku] pleasure

愉しげ[tanoshige] happy
愉悦[yuetsu] joy
愉色[yushoku] cheerful expression
愉快犯[yukaihan] criminal who takes delight in people's reaction to his crimes