(a.) Of or pertaining to simples, or a simplist.

arrested backward coarse conceptually crude crude embryonic in embryo in ovo in the rough intellectually childish oversimple reductionistic reductive rough roughcast roughhewn rude rudimental rudimentary stunted unblown uncultivated uncultured uncut underdeveloped undeveloped unfashioned unfinished unformed unhewn unlabored unlicked unpolished unprocessed unrefined untreated unworked unwrought