crucial
Cross references: 1. acute cru.cial \'kru:-sh*l\ \'kru:sh-(*-)le-\ aj [F, fr. L cruc-, crux cross - more at RIDGE] archaic 1: CRUCIFORM 2: marked by final determination of a doubtful issue : DECISIVE; (Xbroadly : SEVERE, TRYING - cru.cial.ly av