diabolical
In real, traceable use. Part of the curated seed collection; community review is coming.
Sense 1
Meaning · English
(Devilishly) cunning or devious.
Register: slang
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Sense 2
Meaning · English
Crazy, wild (sometimes especially due to being unexpected or surprising).
Register: slang
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “diabolical” mean?
(Devilishly) cunning or devious.
Is “diabolical” formal or informal?
diabolical is generally slang.