It’s in one of Bon Iver’s lyrics.
I couldn’t fing plightless but i did find plight:
There’s 2 definitions
Condition; state; — risk, or exposure to danger, often being implied; as, a luckless plight.
To pledge; to give as a pledge for the performance of some act; as, to plight faith, honor, word; — never applied to property or goods.
hope i helped!
good luck : – )