crucial Antonyms

procedure superfluous supernumerary supervenient supplanter supplemental supplementary surplus tautologic tertiary trifling trivial unconsequential undistinctive unessential superficial superaddition secondary second-class slight small stand-by sub subalternate subjacent subordinate subservient subsidiary substituent substitute succedaneum unknown unoffensive useless nonmeaningful meter maid small-time noncritical noncrucial nonobligatory nurtural non-essential penlight spare part stoppable tinpot unappreciated unhelpful meaningless low-grade