[UN-1 8 + STAY sb.2 3.] Not furnished with, or confined by, stays.

1

1820.  Praed, Bachelor, 97. My waist, unvexed, unstayed, By fetters of the tailor’s trade.

2

1894.  Idler, Sept., 140. In hygienic clothing, A waist and heels deep-loathing, Thy unstayed figure freely flounders.

3