piercing

Appearing to look deeply into; penetrating.

piercing eyes

Of temperature, extremely cold so that it penetrates through clothing and shelter.

Of sound, loud and sharp; shrill.

The piercing noise of the children could be heard two blocks from the elementary school.

In the meantime the saw was stopped and two of the men began filing and sharpening the blades, which produced such a piercing sound that it went through bone and marrow.