"eviler" in the adjective sense
1. evil
morally bad or wrong
"evil purposes"
"an evil influence"
"evil deeds"
2. evil, vicious
having the nature of vice
3. malefic, malevolent, malign, evil
having or exerting a malignant influence
"malevolent stars"
"a malefic force"
Source: WordNet® (An amazing lexical database of English)
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