impure meaning
EN
[-ʊə(r)] FR impure 
- VerbSGimpuresPRimpuringPT, PPimpuredSUF-ure
- (transitive, obsolete) to defile; to pollute.
- (transitive, obsolete) to defile; to pollute.
- AdjectiveCOMmore impureSUPmost impure
- Not pure.
- The impure gemstone was not good enough to be made into a necklace, so it was thrown out.
- Defiled by sin or guilt; unholy; unhallowed.
- Unchaste; lewd; unclean or obscene.
- He was thinking impure thoughts.
- (Judaism) Not virgin, having previously had sexual intercourse.
- Not pure.
Definition of impure in English Dictionary
- Part-of-Speech Hierarchy
- Adjectives
- Verbs
- Transitive verbs
- Transitive verbs
- Adjectives
Source: Wiktionary
Grammatically, this word "impure" is an adjective. It's also a verb, more specifically, a transitive verb.