Perhaps

[Sarah]

By chance; peradventure; perchance; it may be.And pray God, if perhaps the thought of thine heart may be forgiventhee. Acts viii. 22.

[Sarah]

adv.

Possibly but not certainly; uncertain
Maybe; possibly
Risky
No guarentees
Results could be positive or negative

[Sarah]

Something you say when the probability is unsure, maybe for the speaker or the listener or even for both.
A mystery to the listener, the truth known only by the speaker.

[Sarah]

When a person doesn't want to admit you/someone else is right.

[Sarah]

The answer to any question that you don't know the answer to.
In many cases, it leaves the person in a state confused bewilderment when you answer with it.

[Sommer]

Used to express uncertainty or possibility.