Read the sentence.

While we could never prove it, we suspected him of duplicity, so we were never able to fully trust him despite his numerous good deeds.

What is the most likely definition of "duplicity"?

Dishonesty.

Explanation:

The word 'duplicity' is derived from the Latin word 'duplic' which means two-fold.

Duplicity can be defined as a deception or double-dealing, that means there are two personality of you, one that is shown or revealed and second that is hidden, that is covetous. In original, the word 'duplicity' was used to refer to the deception in which a person hides his/her true feelings or intention behind false words or actions.

So, according to the definition provided above, the correct usage of the word 'duplicity' in the given passage is for dishonesty.

Answer:That he duplicated someone else's work

Explanation:duplicity's definition is "double-dealing"