Select the most appropriate SYNONYM of the given word.

SERENITY

Tranquillity 

The most appropriate synonym of the word "serenity" is tranquillity.

• Serenity means "a state of calmness or peacefulness."
• Tranquillity means "the state of being calm, peaceful, and untroubled."

The other words do not have the same meaning as "serenity."

• Avoirdupois means "a system of weight based on the pound."
• Gluey means "sticky or viscous."
• Glutinous means "sticky or viscuous."