be | become | remain | consider sth, regard sth as
Sex is considered taboo as a topic for discussion.

strictly
The subject of death was strictly taboo in their society.

to
Such work was taboo to women.

rigid, strict | deep-seated | cultural, gender, religious, sexual, social | incest

observe
his failure to observe the tribe''s rigid taboos

break, flout, violate | break down
the problem of breaking down deep-seated cultural taboos

reinforce

subject

~ about
the taboo about religion in British society

~ against
the taboo against marrying a foreigner

~ on
reinforcing their taboos on sexuality

~ surrounding
the taboos surrounding menstruation