adverse

/ədˈvɜ(ɹ)s/adjective

Working against you; harmful or unfavorable to your interests or well-being.

Example sentences

“The flight was delayed because of adverse weather conditions.”
“The drug can have adverse effects on some patients.”

Not to be confused with "averse". Conditions and effects are adverse; people are averse to things.

Synonyms for adverse

harmful
unfavorable
detrimental
damaging
negative

Antonyms

favorable
beneficial
positive

Often confused with adverse

adverse vs averse

Related words

aftermathThe period or effects that follow a serious or unpleasant event.aggravateTo make a bad situation, offense, or condition even worse or more serious.agitationA troubled, restless state in which someone's peace of mind is disturbed.agonyVery severe pain or suffering.acheTo feel a steady, dull pain, or to be the cause of such pain.alarmA sudden feeling of fear or worry that something bad or dangerous may happen.