The difference between Pious and Silly

Pious as an adjective:

Of or pertaining to piety, exhibiting piety, devout, godfearing.

Silly as an adjective (of numbers, particularly prices):

Laughable or amusing through foolishness or a foolish appearance. Absurdly large.

Silly as an adjective (chiefly, Scottish, obsolete):

Blessed, particularly: Good; pious. Holy.

Silly as an adjective (now, chiefly, Scottish, and, northern England, rare):

Pitiful, inspiring compassion, particularly: Innocent; suffering undeservedly, especially as an epithet of lambs and sheep. Helpless, defenseless. Insignificant, worthless, especially with regard to land quality. Weak, frail; flimsy . Sickly; feeble; infirm.

Silly as an adjective (now, rural, _, UK, rare):

Simple, plain, particularly: Rustic, homely. Lowly, of humble station.

Silly as an adjective (obsolete):

Mentally simple, foolish, particularly: Rustic, uneducated, unlearned. Thoughtless, lacking judgment. Mentally retarded. Stupefied, senseless; stunned or dazed.

Silly as an adjective (cricket, of a fielding position):

Very close to the batsman, facing the bowler; closer than short.

Silly as an adverb (now, regional, or, colloquial):

Sillily: in a silly manner.

Silly as a noun (colloquial):

A silly person.

Silly as a noun (affectionate, gently, _, pejorative):

A term of address.

Silly as a noun (colloquial):

A mistake.