What does diabolic mean?
Diabolic is an adjective describing something relating to the devil or, more broadly, something wickedly evil, cruel, or cunning. It derives ultimately from the Greek diabolos, meaning 'slanderer', the same root that gave English the word 'devil', which makes the term's connection to demonic imagery historically direct rather than merely figurative. In modern writing, diabolic typically intensifies descriptions of plots, schemes, laughter, or inventions whose cleverness is laced with malice: a diabolic plan is not just bad but perversely ingenious. The word carries strong literary and dramatic connotations, appearing frequently in gothic fiction, crime writing, and criticism of villainous characters. Its longer synonym 'diabolical' is considerably more common in everyday speech and has additionally developed a milder British informal sense meaning simply terrible or appalling — a usage 'diabolic' itself rarely takes on. Choosing 'diabolic' lends a slightly more formal, classical tone to the accusation of evil.
adjectiveOf or relating to the devil or devils; wickedly evil or fiendish in character.
- Relating to or characteristic of the devil or demons.
- Extremely wicked, cruel, or cunning; fiendish.
"The villain's diabolic scheme involved framing his own brother for murder."
"Medieval painters often depicted diabolic creatures lurking at the edges of heaven."
"He devised a diabolic trap that no detective could unravel."
'Diabolic' and 'devil' come from the very same Greek root — diabolos, meaning 'slanderer' — so every time you call something diabolic, you're literally calling it devil-like.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of diabolic
Diabolic comes from the Late Latin diabolicus, borrowed from the Greek diabolikos, formed on diabolos meaning 'slanderer' or 'accuser' — literally one who 'throws across' (from dia- 'across' and ballein 'to throw'). The Greek term was used in early Christian texts as a name for Satan, and it is also the ultimate source of the English word 'devil'. The adjective entered English in the 16th century, alongside its expanded variant 'diabolical', both carrying the sense of being characteristic of the devil.
Related word forms
How diabolic is actually used
Slightly more formal and less frequent than its synonym 'diabolical', which dominates modern usage. In British informal speech, 'diabolical' is also used to mean merely dreadful or of very poor quality ('the service was diabolical'); 'diabolic' rarely carries this weaker colloquial sense.
Easily confused with diabolic
Both words mean fiendishly evil and are essentially variants of each other; 'diabolical' is the far more common form today, while 'diabolic' is a shorter, slightly more formal variant.