scientific student of birds

The police arrested him and told him that being an ornithologist wasn't sufficient excuse to climb onto someones roof with a telescope. 

infamy, vilification

He defended himself against the slander and opprobrium hurled on him.

excessively pushy

Officious means: too eager to tell people what to do and having to high an opinion of your own importance. 
 

-the skin doctor 

casual

She informed her date in an offhand way that she wasn't going out with him again.

boisterous; nosiy

The obstreperous children made it hard for their parents to take them any where.