Not fastened with a pin or pins. Also figurative and in figurative context.

Not laced; spec. (a) having a lace or laces loosened, unthreaded, or removed; (b) not bound or fastened with a lace or laces.

Not nailed.

Without roots (literal and figurative).

Not provided with, or secured by, a girth. Also figurative.

Not latched; not secured or fastened by a latch or similar mechanism.

(un-, prefix1 affix 2.)

Originally: not fastened with a loop. In later use chiefly: not forming or fashioned into a loop or loops.

Not fastened together with a bolt or bolts.

(un-, prefix1 affix 3) Also absol. as n.

Deprived of hinges; taken off the hinges.

Having a clasp undone; (more generally) not fastened. Also figurative.

Without a pulley; (also) not worked by a pulley.

Without a strap; not fitted with straps; spec. of women's dress: without shoulder straps; also absol.

(un-, prefix1 affix 2.)

Not roped; spec. not secured by a rope.

(un-, prefix1 affix 2.)

(See whip, v. 17.)

Having the buckle not fastened.

Not fixed or closed with solder. Also figurative.

Having no string; lacking strings.

(un-, prefix1 affix 2; cf. spiked, adj.2 3a 3b.)

Not fastened with a clip.

Of an item of clothing, bag, or other item: not zipped up; having the zipper open; unzipped. Also (of a person): having one's clothes unfastened by…

Of an item of clothing, bag, or other item: not zipped up; having the zip open.