Word: PERFIDY

Meaning: The word "perfidy" refers to the act of deceit or treachery, especially by betraying someone's trust.

Options:
a) Credence
b) Dissent
c) Treachery
d) Lying

Correct Answer: c) Treachery

Explanation:
The word "perfidy" is often used to describe a deliberate act of betrayal or deception. Let's examine the given options to determine the best synonym for "perfidy":

a) Credence: This word refers to belief or trust in something or someone. It does not convey the sense of betrayal or treachery associated with "perfidy." Therefore, this option is incorrect.

b) Dissent: Dissent means to disagree or have a different opinion. While dissent may involve conflicting views, it does not necessarily imply deceit or betrayal. Hence, this option is not the correct answer.

c) Treachery: This option is the correct answer. "Treachery" means betrayal or an act of deceit. It perfectly captures the meaning of "perfidy" and represents the act of breaking someone's trust or loyalty.

d) Lying: While lying involves deceit, it does not exclusively convey the sense of betrayal or treachery associated with "perfidy." This option does not capture the full meaning of the word and is therefore incorrect.

Summary:
The word "perfidy" means betrayal or treachery. Among the given options, the word "treachery" best expresses the meaning of "perfidy." It accurately conveys the act of deceit or betrayal, capturing the essence of the original word.

'Perfidy' and 'treachery' both mean 'the state of being deceitful and untrustworthy'.