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Answer:
adjective
1.
(especially of a muscle) stretched tight or rigid.
"she tried to relax her tense muscles"
Similar:
taut
stretched tight
tight
rigid
stretched
strained
stiff
Opposite:
slack
loose
2.
unable to relax because of nervousness, anxiety, or stimulation.
"he was tense with excitement"
verb
become tense, typically through anxiety or nervousness.
"her body tensed up"