• grumpled,
• grumpt,
• grroped,
• krimped,
• brumped,
• hrumped,
• geumped,
• gdumped,
• gfumped,
• g5umped,
• g4umped,
• grymped,
• grhmped,
• grjmped,
• grumpeded,
• grumphed,
• grupmpted,
• grumpted,
• grumpeld,
• grimpid

• grumpy,
• Tramped,
• trumpet,
• grouped,
• grumpier,
• grasped,
• Jumped,
• crumpled,
• cramped,
• gripped,
• Groped,
• Romped.

The adverb form of "grumped" is "grumpily".

The adjective form of the word "grumped" is "grumpy".