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