adj.

Causing or capable of causing harm; injurious.

harmfully harm'ful·ly adv.
harmfulness harm'ful·ness n.

adjective

Causing harm or injury: bad, deleterious, detrimental, evil, hurtful, ill, injurious, mischievous. See help/harm/harmless.

adj

Definition: injurious, hurtful
Antonyms: aiding, assisting, helpful, nice, unharmful

---

IN BRIEF: adj. - Constituting a disadvantage; Causing or capable of causing injury; Injurious to physical or mental health adj. - Tending to cause great injury; Contrary to your interests or welfare.

Inhumanity is harmful in every age. — Cicero

Note: click on a word meaning below to see its connections and related words.

The adjective has 6 meanings:

Meaning #1: injurious to physical or mental health
  Synonym: noxious

Meaning #2: able or likely to do harm

Meaning #3: causing or capable of causing harm
  Antonym: harmless (meaning #1)

Meaning #4: constituting a disadvantage
  Synonym: disadvantageous

Meaning #5: contrary to your interests or welfare
  Synonyms: adverse, inauspicious, untoward

Meaning #6: tending to cause great harm
  Synonyms: evil, injurious

---