unclean has definitions from the field of religion
1
[ adjective ] soiled or likely to soil with dirt or grime

Synonyms

dirty soiled

Examples

"dirty unswept sidewalks" "a child in dirty overalls" "dirty slums" "piles of dirty dishes" "put his dirty feet on the clean sheet" "wore an unclean shirt" "Cinderella did the dirty work"

Used in print

(Bruce Palmer, "My Brother's Keeper", Many Are...)

He appeared to be peering haughtily down_his_nose at the crowded and unclean vessel that would carry him to freedom .

2
[ adjective ] (religion) ritually unclean or impure

Synonyms

impure

Examples

"and the swine...is unclean to you"-Leviticus 11:3

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