Any contradiction or paradox.
In the thought of the German philosopher Immanuel Kant (1724–1804): an apparent contradiction between valid conclusions; a paradox.
A riddle, or a difficult problem.
A species of grasshopper, Oedaleonotus enigma.
Mysteriousness; obscurity; lack of clarity.
The Talaud kingfisher, Todiramphus enigma.
A rare species of moth, Heliothis enigma.
A style of literature characterized by obscurity and hints of transcendental meaning.
Something or someone puzzling, mysterious or inexplicable.
A protein with three LIM domains (a conserved cysteine- and histidine-rich structure of two adjacent zinc fingers) at the C terminus that regulates protein phosphorylation.
Riddles and puzzles, collectively.