uptight vs highly strung

uptight and highly strung both are adjectives.

Word	Noun	Adjective	Verb	Adverb
uptight	No	Yes	No	No
highly strung	No	Yes	No	No

As adjectives, uptight and highly strung are synonyms defined as:

Other synonyms of uptight include edgy, high-strung, jittery, jumpy, nervy, overstrung, restive.

uptight (adjective)	highly strung (adjective)
being in a tense state	being in a tense state