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A note on the opening: The video asks about hard work and focus. A word for that is diligence. Rebarbative describes something so unpleasant that it…

Indurate (verb and adjective): As a verb, to make or become hard; as an adjective, hardened or unfeeling.

Apocryphal (adjective): Of doubtful truth or authenticity, especially when describing a widely repeated story.

Procrustean (adjective): Forcing people or things into a rigid system without regard for their differences.

Contumacious (adjective): Stubbornly disobedient or resistant to authority.

Pusillanimous (adjective): Lacking courage or resolution.

Malfeasance (noun): Wrongful conduct, especially by someone carrying out an official or professional duty.

Insouciant (adjective): Casually relaxed and apparently free from worry.

Ephemeral (adjective): Lasting for only a short time.

Saudade (Portuguese noun): A feeling of longing for someone or something that is absent or missed.