1. (a.) Tending to reduce; having the power or effect of reducing.

2. (n.) A reductive agent.

ablative arrested backward coarse conceptually crude contractive crude declining decreasing decrescendo decrescent deductive deliquescent diminishing diminuendo dwindling embryonic erosive in embryo in ovo in the rough intellectually childish languishing lessening on the wane oversimple reductionistic rough roughcast roughhewn rude rudimental rudimentary simplistic stunted subsiding subtractive unblown uncultivated uncultured uncut underdeveloped undeveloped unfashioned unfinished unformed unhewn unlabored unlicked unpolished unprocessed unrefined untreated unworked unwrought waning