1. Of or relating to a geological eon (longer than an era)
   - eonian [N. Amer] 
2. Continuing forever or indefinitely
   - ageless, eonian [N. Amer], eternal, everlasting, perpetual, unending, unceasing

See also: aeon, lasting, permanent

• ill-shapen
• ill-smelling
• ill-sorted
• ill-starred
• ill-tempered
• ill-timed
• ill-treat
• ill-treated
• ill-treatment
• ill-usage
• ill-use
• ill-used
• Illampu
• illation
• illative
• earphone
• earpiece
• earplug
• earreach
• earring
• earshot
• earsplitting
• earth
• earth almond
• earth color