gadfly
a person who annoys others
galvanize
a startle into sudden activity
gamut
the whole range or extent
gauche
lacking social grace
genial
warm, friendly
grandiloquent
speaking in a pompous style
gregarious
fond of the company of others
harangue
a long noisy speech or lecture
harry
to torment another
furtive
done in a stealthy or secretive manner