of very little importance or value; insignificant

Don't bother me with trivial matters.

commonplace; ordinary.

Biology . (of names of organisms) specific, as distinguished from generic.

Mathematics .

noting a solution of an equation in which the value of every variable of the equation is equal to zero.

(of a theorem, proof, or the like) simple, transparent, or immediately evident.

Chemistry . (of names of chemical compounds) derived from the natural source, or of historic origin, and not according to the systematic nomenclature

Picric acid is the trivial name of 2,4,6-trinitrophenol.

adjective

consequential , important , significant , useful , valuable , weighty , worthwhile

adjective

atomic , beside the point * , commonplace , diminutive , evanescent , everyday , flimsy , frivolous , immaterial , inappreciable , incidental , inconsequential , inconsiderable , insignificant , irrelevant , little , meager , mean , meaningless , microscopic , minor , minute , momentary , negligible , nonessential , nugatory , of no account , paltry , petty , piddling * , puny , scanty , skin-deep * , slight , small , superficial , trifling , trite , unimportant , valueless , vanishing , worthless , inconsequent , banal , featherweight , inane , measly , mediocre , nominal , nugacious , ordinary , picayune , unimpressive