harmful (
http://definr.com/harmful)
adj 1: injurious to physical or mental health; "noxious chemical
wastes"; "noxious ideas" [syn:
noxious] [ant:
innocuous]
2: able or likely to do harm
3: causing or capable of causing harm; "too much sun is harmful
to the skin"; "harmful effects of smoking" [ant:
harmless]
4: constituting a disadvantage [syn:
disadvantageous] [ant:
advantageous]
5: contrary to your interests or welfare; "adverse
circumstances"; "made a place for themselves under the
most untoward conditions" [syn:
adverse,
inauspicious,
untoward]
6: tending to cause great harm [syn:
evil,
injurious]