picky / fussy > hard to please as dictated by the person's preference . >She is a picky/fussy eater and hardly ever tries anything new . ( hard to please her taste ) choosy > highly selective / careful in choosing > She is a choosy eater ( very careful to choose the right food) >When it comes to boyfriend , she is too choosy >When it comes to friends , she is too picky ( hard to please her "standard") Above are similar , but differ in context . fastidious > very particular about something being done right / careful and attentive to very detail , or just someone who is hard to please because he is too demanding . > He is a fastidious eater ( meaning he like everything to be perfect with the food) > He is fastidious about how one should arrange the table for dinner : all the eating utensils should be placed correctly .