i Register
In some senses, sidey is marked as dated, colloquial. Watch for register when choosing this word.
adj
Exhibiting side, or unjustified self-importance; arrogant.
"And besides," said the Superior suddenly, "you're too sidey, young man. Calling yourself The Civilian! People won't like that. It's sidey. It'll annoy them. It's uppish."
Insignificant; small-time.
name
A surname.