TENSENESS
tension, tenseness, stress
(noun) (psychology) a state of mental or emotional strain or suspense; “he suffered from fatigue and emotional tension”; “stress is a vasoconstrictor”
tension, tensity, tenseness, tautness
(noun) the physical condition of being stretched or strained; “it places great tension on the leg muscles”; “he could feel the tenseness of her body”
Source: WordNet® 3.1
Etymology
Noun
tenseness (countable and uncountable, plural tensenesses)
The characteristic of being tense.
(phonetics) A particular vowel or consonant quality that is phonemically contrastive in many languages, including English.
Source: Wiktionary