For describing something tight or stretched:
* Tight: This is the most common synonym.
* Stretched: This emphasizes the process of pulling something to make it tight.
* Tensed: This implies a feeling of tension or strain.
* Strained: Similar to tensed, this suggests an effort being made to maintain the tautness.
* Firm: This describes something that is not loose or slack.
* Rigid: This describes something that is stiff and unyielding.
* Stringent: This suggests that something is very tight or strict.
For describing someone's appearance or attitude:
* Tensed: This describes a person who is feeling nervous or anxious.
* Strained: This describes a person who is feeling uncomfortable or stressed.
* Alert: This describes a person who is attentive and focused.
* Prepared: This describes a person who is ready for something.
For describing a situation:
* Intense: This describes a situation that is full of energy or excitement.
* Charged: This describes a situation that is filled with emotion or tension.
* Focused: This describes a situation that is concentrated or directed towards a specific goal.
The best synonym for "taut" will depend on the specific context in which it is used.