riddled Synonyms

unsolved problem saturate riddling riddle question puzzled puzzle puncture problem porous pierce screen screened sieved brainteaser brain-teaser tubulous tubulated suffuse strain sift sifted sieve pervade permeate fistulous filter filled fill enigma diffuse deciphered crowded cribriform conundrum follicular foraminous perforate perforated pepper penetrate overrun jammed interpenetrate imbue honeycombed full cannular