Example of the word implicit used in a sentence

Sentence #1

Implicit in Brian's letter was his unhappiness at having to be away from home for so long.

Sentence #2

The doctor was optimistic, but the implicit meaning of her diagnosis was that Peggy was seriously ill and might not have much longer to live.

Sentence #3

Although you never stated I could use your car, your permission was implicit when you handed me your car keys.

It means suggested or implied but not ever clearly said.

Sentence : Although you never stated I could use your car, your permission was implicit when you handed me your car keys.