A couple at a lackluster party.
- A dull and boring party is an example of something that would be described as a lackluster event.
- A half-hearted and uncaring effort is an example of something that would be described as a lackluster effort.
- lacking brightness; dull: lackluster eyes
- lacking energy or vitality; boring, unimaginative, etc.: a lackluster performance
(comparative more lackluster, superlative most lackluster)