Cambridge English: CPE (C2 Proficiency) - Foolishness & Folly

acting in a foolish or unintelligent manner

having rude or disrespectful manners

an insensitive and uneducated person who lacks culture and manners

(of a person) young and behaving in a manner that displays one's inexperience or immaturity

extremely thoughtless and foolish in speech or action

having an awkward or impolite way of behaving due to a lack of social skills or experience

lack of contact, interaction, or openness with other people or cultures, often leading to narrowness of view

habitually spending money or other resources in a reckless, extravagant, and wasteful way

clumsy or awkward in movement or behavior due to a lack of skill

possessing a limited understanding or point of view, and not open to broadening it

believing things easily even without much evidence that leads to being easy to deceive

talking a great deal, particularly about trivial things

relating to someone who likes to talk much more than necessary

characterized by a ready and continuous flow of speech

done swiftly and without careful thought, driven by sudden and strong emotions or impulses

not fully attentive or focused, often due to worry, anxiety, or preoccupation with other thoughts

showing a tendency to be less strict about rules or discipline

to refuse to hold oneself responsible for something when one should and expect others to deal with it instead

failing to give the needed amount of attention and care toward fulfilling one's obligations

lacking of cleanliness and neatness, often implying a disregard for personal hygiene or grooming

a person who behaves in a ridiculous or amusing way, often to entertain others

clueless or showing a lack of awareness or understanding

lacking meaningful content, purpose, or usefulness

a state of happiness based on false hopes or illusions

slightly crazy, eccentric, or behaving in a way that seems mentally odd

slightly crazy, eccentric, or behaving in a way that seems mentally odd

crazy, eccentric, or acting in a way that seems mentally unsound

showing little or no careful thought or planning

foolish, clownish, or ridiculous behavior intended to amuse or entertain

done, made, or occurring suddenly without sufficient thought

to fight or criticize imaginary enemies or problems