Modifiers matching grump:

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

Simple categories matching impatient:

• person,
• grump,
• detective,
• bully,
• child,
• father,
• writer,
• tyrant,
• heroine,
• politician,
• princess,
• caveman,
• policeman,