not conforming with accepted standards of behaviour or morality.
not appropriate
Most nations have laws against indencency, usually regulating acts and displays which are deemed to be indecent.
Standards of what constitutes "indecent" will obviously vary greatly from country to country based on culture, religion, and other social norms, but broadly speaking, indecency usually refers to:
obscenity, such as swearing and other forms of foul or offensive language
sexually explicit materials, often including forms of nudity
In canon law carnal intercourse, licit or otherwise, is the principle of affinity; in Roman law, it is valid marriage, whether consummated or not.
By carnal intercourse public decency gives way to affinity, and, though some deny this, all admit that in a petition for a dispensation it is sufficient to express the impediment of affinity, while public decency, if it still exist, is understood.
Since the impediment of public decency is of ecclesiastical origin it follows that the Church may dispense from it, and that it does not affect unbaptized persons, even though later they become Christians.