Quixotic / kwik-ˈsä-tik / adj.

Definition: The word quixotic can be used for someone or something that is innocently idealistic, possessed with romantic optimism, and particularly in the pursuit of unrealistic ideals. This is often characterized by rash lofty starry-eyed ideas or over-the-top chivalrous actions. 

Etymology: The word quixotic comes from Cervantes’ Spanish 17th-century satirical novel entitled Don Quixote de la Mancha. In the novel, the title character is absurdly romantic and indulges in impulsive schemes and great chivalry. It was translated to English in the late 18th century.

In a Sentence

In the middle of a pandemic such as Covid 19, with high unemployment and retrenchments, it is quixotic to even imagine quitting your job with the hope of finding another easily.

From the onset, Donald knew running for the presidency was a quixotic idea, but he had no intention of letting his enemy run unopposed.

It is quixotic to consistently cheat without remorse and think you can get away with apologizing with flowers and chocolate.

Synonyms 

Impulsive, Idealistic, Visionary

Antonyms 

Clear-eyed, Realistic, Practical