Pick out the meaning of the following pair of words from the given options:

Vain, Wane

useless, decline

The correct meaning of the pair of words "Vain, Wane" is:

useless, decline

Explanation:

• "Vain" means having an excessively high opinion of one's abilities or appearance, often with a sense of superiority. It can also mean producing no result or effect.
• "Wane" means to decrease gradually in size, intensity, or power.

Therefore, the pair "Vain, Wane" suggests a connection between something being useless or producing no result and a decline or decrease in intensity or power.