Definition of ill effect
- He was able to stop taking the drug with no ill effects.
: immoral, vicious
: resulting from, accompanied by, or indicative of an evil or malevolent intention
: attributing evil or an objectionable quality
: with displeasure or hostility
: in a harsh manner
: so as to reflect unfavorably
: the reverse of good : evil
: misfortune, distress
: ailment, sickness
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