impersistent /im-pər-sisˈtənt/

1. Not persistent
2. Not enduring

• thumblike
• thumbling
• thumblings
• thumb mark
• thumb-marked
• thumb marks
• thumbnail
• thumbnails
• thumbnail sketch
• thumbnut
• thumbnuts
• thumb one's nose
• thumb piano
• thumb pianos
• thumbpiece
• thumbpieces
• thumbpot
• thumbpots
• thumbprint
• thumbprints
• thumb ring
• thumb rings
• thumbs
• thumbscrew
• thumbscrews