The word "un-fussier" means someone who is easy-going, relaxed and not difficult. The antonyms for this word include words such as fussy, picky, choosy, finicky, nagging and demanding. While an un-fussier person is easy to get along with, a fussy person is difficult, always complaining and hard to please. Being picky means being selective, but also being judgmental and often rejecting options that may be suitable. Someone who is choosy is also selective but in a positive sense, preferring better quality items. Finicky individuals are often unnecessarily concerned with minor details. Finally, someone who is nagging and demanding can be draining and cause a lot of stress.