tense1
  
  adj.
   - (especially of a muscle) stretched tight or rigid.
 - (of a person) unable to relax. 
▸causing or showing anxiety and nervousness.
 - Phonetics  (of a speech sound, especially a vowel) pronounced with the vocal muscles stretched tight. The opposite of lax.
 
v.
 make or become tense.
 
  Derivative
  
    - tensely adv.
  - tenseness n.
  - tensity n. (rare).
 
   
  Etymology
  C17: from L. tensus, tendere ‘to stretch’.
 
  
    
tense2
  
  n.
 Grammar  a set of forms taken by a verb to indicate the time (and sometimes the continuance or completeness) of the action in relation to the time of the utterance.
 
  Derivative
  
  Etymology
  ME: from OFr. tens, from L. tempus ‘time’.