The distinction between solids and fluid is not entirely obvious.

West would have to shift to a spade after winning with the diamond queen, which is not entirely obvious.

It's not entirely obvious as to when the .2 payment must be made.

Why that should be so isn't entirely obvious.

The clue to the whisky affair is not entirely obvious.

The truth, not entirely obvious, is that the contract was unbeatable after the opening lead.

But the political overtones are inescapable, if not entirely obvious.

That is not entirely obvious, but consider how the play might develop after, for example, a club lead.

Also used when you are making fun of someone for something entirely obvious.

She can be funny in a not entirely obvious way.