Как перевести riddle на русский язык

Часть речиЗначениеАнглийские синонимы
na coarse sieve (as for gravel)
riddle;
na difficult problem
vset a difficult problem or riddle
riddle;
vexplain a riddle
riddle;
vspeak in riddles
riddle;
vspread or diffuse through
vpierce with many holes
riddle;
vseparate with a riddle, as grain from chaff
riddle; screen