inscrutability

concealment denseness seclusion secrecy thickness

enlightenment

revelation

brightness cognizance day daylight daytime illumination intelligence light lightness morning sense sensibility understanding

mystery secrecy

concealment denseness obscurity privacy

revelation

light openness

conundrum enigma problem question riddle secrecy subtlety thriller

abstruseness charade chiller cliffhanger crux cryptogram difficulty grabber mystification occult oracle perplexity poser puzzlement rebus rune sphinx stickler stumper teaser twister whodunit why

brainteaser braintwister closed book inscrutableness mindboggler sixty-four thousand dollar question tough nut to crack

known understanding

puzzlement

abstruseness charade chiller cliffhanger conundrum crux cryptogram difficulty enigma grabber mystification occult oracle poser problem puzzle puzzler question rebus riddle rune secrecy sphinx stickler stumper subtlety teaser thriller twister whodunit why

brainteaser braintwister closed book inscrutableness mindboggler sixty-four thousand dollar question tough nut to crack

harmony

deadpan deadpan expression impassivity mask seriousness straight face

abstruseness charade chiller cliffhanger conundrum crux cryptogram difficulty enigma grabber mystification occult oracle perplexity poser problem puzzle puzzlement question rebus riddle rune secrecy sphinx stickler stumper subtlety teaser thriller twister whodunit why

brainteaser braintwister closed book inscrutableness mindboggler sixty-four thousand dollar question tough nut to crack

harmony