Synonyms for the word "prissiest" encompass various terms that describe someone overly fussy, prim, or excessively concerned with appearances and proper behavior. Some alternatives to "prissiest" include "fussy", highlighting unnecessary attention to details; "prim", emphasizing an individual's excessively formal and rigid demeanor; "fastidious", indicating meticulousness and high standards; "precious", underlining a delicate, overly refined attitude; "pedantic", emphasizing excessive focus on minor details; and "pernickety", stressing being excessively particular and insisting on perfection. All these synonyms convey the essence of someone who is overly concerned with rules, appearance, and trivial matters, often revealing an air of superiority and lacking spontaneity.