ETYM Latin indecens unseemly, unbecoming: cf. French indécent. Related to In- not, and Decent.
1. Not in keeping with accepted standards of what is right or proper in polite society; SYN. indecorous, unbecoming, uncomely, unseemly, untoward.
2. Offending against sexual mores in conduct or appearance.
3. Offensive to good taste especially in sexual matters.