General:
* Tasteless: This is the most common and direct word, meaning lacking taste or flavor.
* Flavorless: Similar to tasteless, but emphasizes the lack of any distinct flavor.
* Insipid: This word implies a lack of taste and a general blandness.
Specific:
* Bland: This describes something that has little or no flavor, but is not necessarily unpleasant.
* Unpalatable: This describes something that is unpleasant to taste, often because it is bitter or sour.
* Unsavory: This describes something that is distasteful, often because it is morally or ethically questionable.
Literary:
* Sapidless: This is a more formal and literary word for tasteless.
* Insapid: Similar to sapidless, but implies a lack of any kind of sensory excitement.
The best word to use will depend on the specific situation and what you want to convey.