Is it ensure, insure, or assure?
"wavy ornamental edging," 1801 (with a doubtful attestation from 1590s), of uncertain origin despite much speculation [see OED]; figurative sense of "useless ornament" first recorded 1893. The verb meaning "to furnish with a frill" is recorded in 1570s. Related: Frilled.
A woman, esp a young woman; frail (1920s+)