Solutions unthinking advice not to be so resentful has 5 entries with similar clues

• 7-letter words
• gung-hoUnthinkingly eager
• 8-letter words
• fecklessUnthinking and irresponsible
• kneejerkunthinking, of a reaction
• jingoismUnthinking patriotism
• 9-letter words
• knee-jerkOf a response automatic and unthinking