pissant

Short definition from Wiktionary

Noun

1. 1
   An ant.
2. 2
   An insignificant person.
3. 3
   A person who adheres strictly to a rule or policy despite current circumstances.
4. 4
   A person seemingly incapable of focusing on anything but the trivial, especially in the sense of trivial or irrelevant criticism.

Adjective

1. 1
   Insignificant or unimportant.