late 14c., from loose (adj.) + -ly (2). Similar formation in Dutch losselijk, Old Norse lausliga, Danish löselig.
his hands lay loosely
a union of loosely federated states
loosely structured organization
loosely woven cloth
loosely knit
loophole
loopy
loose
loose cannon
loose-leaf
loosely
loosen
looseness
loot
looter
looting