Wicked

1. Evil or mischievous by nature. Synonyms: **evil, immoral, malevolent, malicious, nefarious, twisted, villainous; Thesaurus:evil
2. (slang) Excellent; awesome; masterful. Synonyms: awesome, bad, cool, dope, excellent, far out, groovy, hot, rad; excellent

Usage notes

Use of "wicked" as an adjective rather than an adverb is considered an error in the Boston dialect.^[1] However, that is not necessarily the case in other New England dialects.