uptight

adj

1. (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.”

2. Emotionally repressed; nervous and tense.
3. (colloquial)Sexually repressed.

   “He came from a very uptight religious background, but you wouldn't know that now!”

4. (colloquial)Unfriendly or rude.

   “Withnail: Just because the best tailoring you’ve ever seen is above your fucking appendix doesn’t mean anything. / Danny: Don’t get uptight with me, man.”

noun

1. (colloquial)An uptight person.