2. Disgusting and morally offensive; especially, through an apparent total disregard for others' rights or natural justice.
3. Inciting lustful feelings; lewd; abominable; disgusting; repulsive.
4. From 1593, with the meaning of "disgusting, foul, loathsome", and "repulsive" which was borrowed from Middle French obscene, and a learned borrowing from Latin obscenus, "offensive"; especially, to modesty.
Apparently it was originally a term for the augurs' vocabulary, meaning of "ill omen, boding ill"; also, of uncertain origin.
Unacceptable and offensive language
A profanity or a filthy word, a swear word, a curse word, a dirty word; or collectively foul, bad or strong language. Under current colloquial use, it is a word, expression, gesture, or other usage which is socially considered to be insulting, rude, vulgar, or offensive.
Kerri thinks it is obscene that it is possible to purchase lewd pictures when a person is visiting a tourist agency.