someone who canbehave,work, andlivein a way thatseemsnormalalthoughthey areaddictedto(=unabletostopusing too much)alcohol,drugs, etc.:
Whilefunctionalalcoholicsdrinkexcessively, most do notdisplaytheobviousphysicalorpsychologicaldamageassociatedwithalcoholism.
Heprobablyfallsinto thecategoryoffunctionalalcoholic.
Manyfunctionaladdictsholdfull-timejobs.
Synonymafunctioningalcoholic/addict, etc.
See alsofunctional(WORKING NORMALLY)