Modifiers matching grump:

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

Simple categories matching penny-pinching:

• grump,
• businessman,
• person,
• miser,