plightful
Full of risk or danger; risky; dangerous; perilous.
This is their doom that here in sin Lie and their sins will not cease; But would they think about Judgment Day, It behooves them to leave their plightful play.
Full of plight; plighted; pledged; devoted.
She liv'd and lov'd.―I wedded two. 'The Devil!'―Yes. What could I do? To her I ow'd my plightful vow, To Ruth, my life, and freedom now.
Where it comes from
From Middle English plightful, plihtful, equivalent to plight + -ful.
Adapted from the Wiktionary entry plightful (CC BY-SA 4.0).