(of behaviour, a person) not showing an interest in being bad or good

immoral, uncontrolled

(of a person) often changing one's feelings about another person

vacillating, blowing hot and cold

covered with grease

slippery, oily

not consistent; contradictory; having parts that do not agree

contradictory, irregular

feeling, causing, showing, lust

sexually aroused; displaying excessive interest in sex

immoral about sexual matters

immoral, uncontrolled

(of a person) often changing (in opinion, temper etc)

flighty, temperamental

(of a speech, book, picture etc) obscene; indecent

lascivious

done efficiently and well (but perhaps with a little deceit)

smooth, polished

(of a surface) smooth, wet, polished etc so that it is difficult to stand or to move on, or hold; needing care

smooth, slick

(of a person, condition) not stable

doubtful

(of a liquid) that easily changes into gas or vapour; (of a person, mood) changing quickly or easily from one mood or interest to another

explosive, changeable

of, for, causing or expressing sensual or sexual pleasure

given to sensual pleasure; pleasurable to the senses

wavy

doubtful, weak