1. comparative form of ill; more sick or unwell
Usage: standard comparative of 'ill'
2. comparative form of ill; more bad, harmful, or unfavorable
Usage: formal or literary use
3. more impressive, skilled, or excellent
Usage: slang; informal

Examples

• She felt iller after taking the medication.
• The iller patients were moved to the intensive care unit.
• His behavior had an iller effect on the team's morale.
• That new album is iller than the last one.
• The iller the weather, the fewer people visit the park.
• He's iller today than he was yesterday.