Synonyms of the word

lackluster

• adj. Lacking brilliance or intelligence.
• adj. Having no shine or lustre; dull.
• adj. Not exceptional; not worthy of special merit, attention, or interest; having no vitality.
• n. A person or thing of no particular brilliance or intelligence.

dull

• adj. Lacking the ability to cut easily; not sharp.
• adj. Boring; not exciting or interesting.
• adj. Not shiny; having a matte finish or no particular luster or brightness.
• adj. Not bright or intelligent; stupid; slow of understanding.
• adj. Sluggish, listless.
• adj. Cloudy, overcast.
• adj. Insensible; unfeeling.
• adj. Heavy; lifeless; inert.
• adj. (of pain etc) Not intense; felt indistinctly or only slightly.
• adj. (of a noise or sound) Not clear, muffled.
• v. (transitive) To render dull; to remove or blunt an edge or something that was sharp.
• v. (transitive) To soften, moderate or blunt; to make dull, stupid, or sluggish; to stupefy.
• v. (intransitive) To lose a sharp edge; to become dull.
• v. To render dim or obscure; to sully; to tarnish.

lacklustre

• adj. (British) Alternative spelling of lackluster.
• n. (British) Alternative spelling of lackluster.

lusterless

• adj. Without luster, dull, not shiny, flat or matte finished.
• adj. Without brilliance, unremarkable.

lustreless

• adj. (chiefly UK) Alternative spelling of lusterless.