Modifiers matching grump:

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

Simple categories matching penny-pinching:

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