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ENGLISH DICTIONARY

Adj
Pronunciation: [ˌdaɪəˈbɒlɪkəɫ]

Definition 1:
• Of or concerning the devil: devilish, satanic.
Wiktionary-listed synonyms: daemonical, demonic, diabolic

Definition 2:
• Extremely wicked or cruel.
Example: a diabolical plan
Wiktionary-listed synonyms: baneful, malevolent, malicious, barbarous, bowelless, brutal, compassionless, cruel, flagitious, demonic, despiteful, diabolic, diabolical, fell, incessive, inclement, inhuman, inhumane, merciless, nasty, nonhumane, pitiless, remorseless, rotten, ruthless, sadistic, savage, spiteful, truculent, unbenevolent, unbenign, unkind, unmerciful, unpitiful, unpitying, abandoned, arrant, bad, bad apple, bad seed, baleful, scurrilous, base, black-hearted, dark, deleterious, depraved, despicable, detrimental, devilish, evil, evil-minded, facinorous, harmful, heinous, ill-intentioned, ill-natured, immoral, incorrigible, iniquitous, iniquous, injurious, knavish, malefic, maleficent, malign, malignant, naughty, nefarious, niddering, nidering, niding, nithing, no-good, peccaminous, pernicious, reprehensible, reprobate, satanic, scathful, sinful, sinister, sordid, sullen, ungodly, unholy, vicious, vile, villainous, wicked, wrong

Definition 3:
• (Devilishly) cunning or devious.
Wiktionary-listed synonyms: crafty, sly, tricksy, astute, artful, cautelous, cunning, devious, diabolical, foxlike, foxy, frood, guileful, shrewd, slim, subtle, tricky, vulpine, wily
Labels: slang

Definition 4:
• Crazy, wild (sometimes especially due to being unexpected or surprising).
Labels: slang

Source and attribution
Wiktionary contributors, via Kaikki/Wiktextract. Derived from Wiktionary; CC BY-SA and GFDL terms apply. Source: https://en.wiktionary.org/wiki/diabolical