taut

Short definition from Wiktionary

Adjective

1. 1
   Under tension, like a stretched bowstring, rope, or sail; tight.
2. 2
   Not flabby; firm, toned; (of a person) having a lean, strong body.
3. 3
   Containing only relevant parts; brief and controlled.
4. 4
   Experiencing anxiety or stress.
5. 5
   Neat and well-disciplined; (by extension) efficient and in order.
6. 6
   Strong; uncompromising.

Verb

1. 1
   To make taut; to tauten, to tighten.