not pure; mixed with extraneous matter, esp. of an inferior or contaminating nature

impure water and air.

modified by admixture, as color.

mixed or combined with something else

an impure style of architecture.

regarded by a religion as unclean, as animals or things.

not morally pure or proper; unchaste or obscene

impure thoughts.

marked by foreign and unsuitable or objectionable elements or characteristics, as a style of art or of literary expression.

adjective

chaste , clean , impeccable , pure , sterile

adjective

admixed , adulterated , alloyed , carnal , coarse , common , contaminated , corrupt , debased , defiled , desecrated , diluted , dirty , doctored , filthy , foul , gross * , grubby * , immodest , immoral , indecent , infected , lewd , nasty , not pure , obscene , polluted , profaned , smutty * , squalid , sullied , tainted , unchaste , unclean , unrefined , unwholesome , vile , vitiated , weighted , wicked , uncleanly , loaded , sophisticated , barbarous , base , blemished , gross , hybrid , indelicate , inferior , macular , maculate , smutty , unhallowed , unholy , unrectified , vulgar