meanspirited

{'source': 'Times Litt. Sup.', 'text': 'it seems ungenerous to end this review of a splendid work of scholarship on a critical note'}

a meanspirited man unwilling to forgive

{'source': 'Edmund Burke', 'text': 'that liberal obedience without which your army would be a base rabble'}

taking a mean advantage

{'source': 'Shakespeare', 'text': "chok'd with ambition of the meaner sort"}

something essentially vulgar and meanspirited in politics