Modifiers matching grump:

• heartless,
• covetous,
• greedy,
• grouchy,
• arrogant,
• condescending,
• ill-tempered,
• penny-pinching,
• wealthy,
• gruff,
• principled,
• impatient,
• mean,
• miserly,
• misanthropic,
• jealous,
• grizzled,
• rich,
• fastidious,

Simple categories matching greedy:

• tyrant,
• smuggler,
• vampire,
• demon,
• person,
• investor,
• fascist,
• villain,
• billionaire,
• king,
• ceo,
• businessman,
• killer,
• mastermind,
• conqueror,
• singer,
• aristocrat,
• narcissist,
• bully,
• revolutionary,
• dictator,
• robot,
• politician,
• clerk,
• terrorist,
• psychopath,
• royal,
• spy,
• thug,
• criminal,
• thief,
• actor,
• assassin,
• miser,
• tycoon,
• grump,
• traitor,
• emperor,
• playboy,
• warrior,