The letter was a forgery.

这封信是伪造品。

《柯林斯英汉双解大词典》

The painting was declared to be a forgery.

这幅画被判定为赝品。

《牛津词典》

Experts are dismissing claims that the painting is a forgery.

专家排除了这幅画是赝品的说法。

《牛津词典》

Louis archive for three decades, looked at the document and pronounced it a forgery.

NEWYORKER: The Apostate

Garriott later disputed the letter, saying it was a forgery used to remove him from the company.

FORBES: Richard Garriott's 'Shroud Of The Avatar: Forsaken Virtues' Launches On Kickstarter

If the inspector comes and says 'it's a forgery, ' you say 'oh my God, did I inherit a forgery?

BBC: NEWS | Entertainment | Italy struggles with art crime wave