User:Simon loquacious/sandbox

What does lacklustre mean?

lack·lus·ter
(lăk′lŭs′tər) adj.

Lacking brightness, luster, or vitality; dull. See Synonyms at dull.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

lack•lus•ter
(ˈlækˌlʌs tər) adj.

1. lacking brilliance or radiance; dull: lacklustre eyes.

2. lacking liveliness or vitality: a lacklustre performance. n. 3. a lack of brilliance or vitality. Also, esp. Brit.,lack′lus`tre.