Peevish

adjective

1. Characterized by or exhibiting petty bad temper, bad-tempered, moody, cross.

   "I would rather figure things out on my own than ask that peevish librarian for help."

2. Constantly complaining, whining; childishly fretful.

   "Peevish patients in the doctor's waiting room."

3. Easily annoyed, especially by things that are not important; irritable, querulous.
4. (adverb) Peevishly.
5. Clever, expert.