riddling
rid-dling
adjective
Puzzling or enigmatic; difficult to understand or explain.
"She posed a riddling question to the group."
noun
The act of passing a substance through a large sieve or riddle.
"The riddling of the sand separated the stones."
Thesaurus
Synonyms: riddle, enigma, conundrum, brain-teaser, screen, diffuse, interpenetrate, penetrate, pervade, imbue, permeate