Uptight

Full definition of uptight

(colloquial) Excessively concerned with rules and order, always serious.
Don't be so uptight! You won't go to jail for crossing the street against the light.
Emotionally repressed; nervous and tense.
(colloquial) Sexually repressed.
He came from a very uptight religious background, but you wouldn't know that now!
(colloquial) Unfriendly and rude.

(plural uptights)