Unpopular, unhappy, independent, unhealthy, impractical, unusual, informal, unfashionable, incorrect, unimportant, impossible, uninteresing, unpleasant, immature, uncomfortable, unsuccessful
1.People don't eat a big fried breakfast any more because it's unhealthy
2.This crossword is unusual.I can't solve any of the clues.
3.The book looked rather unintresting so i didn't buy it.
4.Jam and cheese is an unpopular combination but i love it.
5.He's so immature. He behaves like a three-year-old sometimes.