Forbidden (5)
'forbidden' is the definition.
(synonyms)
This is all the clue.
(Other definitions for taboo that I've seen before include "By religion or custom, not to be done or touched" , "Not to be mentioned" , "Forbidden for social reasons" , "Prohibited; ban" , "Socially forbidden" .)
'forbidden' is the definition.
('prohibit' can be a synonym of 'forbid')
This is all the clue.
(Other definitions for prohibited that I've seen before include "Criminal" , "Banned" , "off-limits" , "Forbidden" .)
'forbidden' is the definition.
(synonyms)
This is all the clue.
(Other definitions for proscribed that I've seen before include "Forbidden" , "on the banned list" , "outlawed" .)
'forbidden' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for tabu that I've seen before include "Prohibited practice" , "delicate matter?" , "Ban resulting from social custom" , "Unacceptable" , "banned" .)
'forbidden' is the definition.
(barring is a kind of forbidding)
This is the entire clue.
(Other definitions for barred that I've seen before include "Prohibited" , "Excluded, blocked" , "Refused access to, say pub" , "Wouldn't allow" , "Precluded, obstructed" .)
'forbidden' is the definition.
(banning is a kind of forbidding)
This is all the clue.
(Other definitions for banned that I've seen before include "Barred" , "expelled" , "Taboo" , "Group on radio" , "Censored" .)
'forbidden' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for illegal that I've seen before include "Prohibited by law" , "Criminal, illicit" , "Wrong" , "Ignoring certain acts" , "Not allowed" .)