tension
noun
1 the tension of the rope:
tightness, tautness, tenseness, rigidity;
pull, traction, stress, strain, straining, stretching;
rare tensity.
▷antonyms slackness, looseness.
2 the tension was unbearable:
mental/emotional strain, stress, anxiety, anxiousness, pressure;
worry, apprehensiveness, apprehension, agitation, nerves, nervousness, jumpiness, edginess, restlessness;
suspense, uncertainty, anticipation, excitement;
informal butterflies (in one's stomach), collywobbles, jitteriness, twitchiness, the jitters, the willies, the heebie-jeebies, the shakes, the jumps, jim-jams, the yips;
British, informal the (screaming) abdabs/habdabs;
Australian, rhyming slang Joe Blakes.
▷antonyms relaxation.
tension Oxford Dictionary of English