new word

Basic explanation and detailed explanation

Seek personal gain by improper means. It also refers to using cleverness.

derogatory sense

tidy

Chen Yi's poem "Opposing American Imperialism's Aggression in the Middle East": "It is most shameful to be opportunistic."

example sentence

Learning requires hard work, one step at a time, and fraud is not allowed.

Approximate antonym

Synonyms improvise, turn the rudder, play it by ear, sail before the wind, occasionally turn the rudder, cheat, cheat, be lazy, play tricks, sell short, buy short and speculate.

Antonym gentleman