Modifiers matching grump:

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

Simple categories matching jealous:

• genius,
• fool,
• pianist,
• grump,
• person,
• pretender,
• lover,
• tyrant,
• criminal,
• psychopath,
• duck,
• snob,
• son,
• killer,
• villain,
• aristocrat,
• child,
• clown,
• musician,
• teenager,
• composer,