1. (a.) Not pure; not clean; tainted\; dirty; foul; filthy; containing something which is unclean or unwholesome; mixed or impregnated extraneous substances; adulterated; as, impure water or air; impure drugs, food, etc.

2. (a.) Defiled by sin or guilt; unholy; unhallowed; -- said of persons or things.

3. (a.) Unchaste; lewd; unclean; obscene; as, impure language or ideas.

4. (a.) Not purified according to the ceremonial law of Moses; unclean.

5. (a.) Not accurate; not idiomatic; as, impure Latin; an impure style.

6. (v. t.) To defile; to pollute.

Adamic Doric Fescennine Rabelaisian adulterated alloyed backsliding barbaric barbarous bawdy belowstairs besmirched black blemished blue cacophonous carnal clumsy coarse common contaminated corrupted crude damaged debased defective deficient defiled degenerate depraved dirty dissolute doggerel dysphemistic erring erroneous evil fallen fallible faulty feculent filthy fleshly forbidden foul foul-mouthed foul-spoken foul-tongued found wanting frail fulsome graceless gross grubby harsh immature immodest immoral impaired imperfect imprecise improper in bad taste inaccurate inadequate incomplete inconcinnate inconcinnous incorrect indecent indecorous inelegant inexact infected infelicitous infirm ithyphallic lacking lapsed lascivious lecherous lewd libidinous licentious loose low lubricious lubricous lurid lustful maculate makeshift mediocre mixed nasty native nonkosher not perfect obscene of easy virtue off offensive outlandish partial patchy peccable polluted pornographic postlapsarian prodigal promiscuous prurient putrescent putrid raunchy raw recidivist recidivistic ribald ritually unclean rotten rude run-of-mine salacious scarlet scummy scurrile scurrilous sensual short sinful sketchy smirched smoking-room smutty soiled soily squalid sullied sultry tainted tasteless tref unangelic unbathed unchaste unclean uncleanly uncourtly uncouth undeveloped undignified uneuphonious uneven unfelicitous unfinished ungodly ungood ungraceful ungraded unhallowed unholy unperfected unpolished unprintable unpure unrefined unrepeatable unrighteous unsaintly unscoured unscrubbed unseemly unsorted unsound unswept unthorough unvirginal unvirtuous unwashed unwiped vile virtueless vitiated vulgar wanting wanton wayward weak wicked