Gadfly
Noun, a person annoys another especially by rousing them from complacency
Furtive
Adj, done in a stealthy or secretive manner
Galvanize
Verb, to startle into sudden activity
Gamut
Noun, the whole range or extent
Gauche
Noun, lacking social grace
Genial
Adj, warm friendly
Grandiloquent
Adj, speaking in a pompous style
Gregarious
Adj, fond of the company of others, belonging to a flock
Harangue
Noun, a long noisy speech or lecture
Harry
Verb, to torment another