Tension
Tautness
Synonyms: Tightness, tenseness, pull, stress, straining, tensity, tautness, rigidity, traction, strain, and stretching.
Stress
Synonyms: Mental/emotional strain, anxiety, pressure, apprehensiveness, agitation, nervousness, edginess, suspense, anticipation, butterflies (in one's stomach), jitteriness, the jitters, the heebie-jeebies, the jumps, the yips, Joe Blakes, stress, anxiousness, worry, apprehension, nerves, jumpiness, restlessness, uncertainty, excitement, collywobbles, twitchiness, the willies, the shakes, jim-jams, and the (screaming) abdabs/habdabs.
Unease
Synonyms: Strained relations, unease, friction, antipathy, enmity, strain, ill feeling, antagonism, and hostility.
Example Sentences
The tension was almost unbearable.
Tension grew as night fell.
Their argument caused noticeable tension.
Tension filled the quiet room.