Nuisible.
1. Able or likely to do harm.
2. Causing or capable of causing harm.
1. Badly behaved; SYN. naughty.
2. Deliberately causing harm or damage
1. Mischievous; perverse; guilty of disobedient or improper conduct
2. Corrupt; wicked.
ETYM Latin noxius, from noxa harm; akin to nocere to harm, hurt. Related to Nuisance, Necromancy.
Injurious to physical or mental health; SYN. harmful.
Harmful.