What are synonyms for lackluster?

Here are some synonyms for "lackluster," categorized by their intensity and connotation:

General:

* Dull

* Uninspired

* Mediocre

* Unremarkable

* Bland

* Tiresome

* Flat

* Uninteresting

* Subpar

Negative:

* Weak

* Faded

* Poor

* Ineffective

* Disappointing

* Unsatisfactory

* Tepid

* Listless

* Spiritless

Formal:

* Uninspiring

* Unremarkable

* Lacking vitality

* Deficient in brilliance

* Depleted of enthusiasm

Informal:

* Blah

* Ho-hum

* Yawn-inducing

* Not worth it

The best synonym for "lackluster" will depend on the specific context and the nuance you want to convey.