nastiness, n. squalor, filthiness, [pollution], [filth], [corruption], dirtiness; [indecency], [smut], [obscenity], bawdry, [ribaldry], [indelicacy], [lewdness].
nasty, a. [filthy], [squalid], [foul], polluted, [dirty]; [indecent], [indelicate], [gross], [ribald], [lewd], [obscene], [smutty], [shameless]; [odious], [sickening], [repulsive], [nauseous], [disgusting], [disagreeable].
native, a. natal; indigenous, [natural], aboriginal, autochthonal; vernacular, [mother]; [genuine], congenital, [inherent], [inborn], inbred, [innate], [original]. Antonyms: [foreign], [artificial], exotic, acquired, [assumed], [unnatural].
native, n. aboriginal, denizen (by birth), indigene.
natives, n. pl. aborigines.
natty, a. (Colloq.) [neat], [spruce], [trim], [jaunty], [dapper], [chic].
natural, a. [native], [inborn], congenital, [innate], [characteristic]; [original], indigenous; [normal], [regular], [legitimate]; [artless], [unaffected], ingenuous, [spontaneous], [simple]; unregenerate. Antonyms: [unnatural], acquired, [affected], simulated.
naturalization, n. denization.
naturalize, v. [familiarize], [accustom], [habituate], acclimatize, [adapt], [acclimate].
natural philosophy. physics.