riddle

(noun) a difficult problem. Synonyms: conundrum, enigma, brain-teaser.

(noun) a coarse sieve (as for gravel).

(verb) pierce with many holes. Example: "The bullets riddled his body."

(verb) set a difficult problem or riddle. Example: "Riddle me a riddle."

(verb) separate with a riddle, as grain from chaff. Synonyms: screen.

(verb) spread or diffuse through. Synonyms: permeate, pervade, penetrate, interpenetrate, diffuse, imbue. Examples: "An atmosphere of distrust has permeated this administration." "Music penetrated the entire building." "His campaign was riddled with accusations and personal attacks."

(verb) speak in riddles.

(verb) explain a riddle.