uptight

緊張した、不安な、型にはまった、お堅い

Ex

• Calm down, don’t be so uptight about it.
• She was too uptight to allow herself to experiment a new hair style.

Reference source

• http://xn--qckr8lpb6580ao63e.xn--ccks5nkbz150dj5j.net/slang_u/uptight.html