Here's what rhymes with unstale.
pale tail tale jail bail stale bale dale pail male scale fail mail sale sail trail nail rail veil frail gale hail shale whale vale wail snail flail hale braille kale faille wale hightail detail avail entail email assail curtail quail quale bewail derail unveil grail impale prevail travail inhale exhale gunwale mainsail pigtail ponytail topsail foresail monorail taffrail bobtail wassail pellmell carrell martingale nonpareil swallowtail hangnail lugsail fingernail countervail tattletale