big-time bandit; notorious pirate
Refers to a large-scale or infamous bandit or pirate, often with a historical or dramatic tone. Not an everyday word; more likely encountered in fiction, historical accounts, or metaphorical use.
That pirate was feared as a notorious pirate who went down in history.
He was a large-scale fraudster who could be called a modern-day big-time bandit.
Compound of 巨 (きょ, 'huge') and 賊 (ぞく, 'bandit, thief'). The exact historical derivation is uncertain, but the word follows a standard Sino-Japanese pattern for forming nouns.