Answer:

uptight

Answer	Crossword Clue
UPTIGHT	Tense
UPTIGHT	Jittery
UPTIGHT	Rigidly conventional

UPTIGHT	Unable to relax
UPTIGHT	Overly conventional, in slang
UPTIGHT	Hardly laid-back
UPTIGHT	Antsy
UPTIGHT	In need of a chill pill
UPTIGHT	Edgy
UPTIGHT	Not loose