2 adjectives to describe speechlessness

He kept his sinecure by mastering his tongue, preserving almost bovine speechlessness.

And so, until they got into his own country, the strained speechlessness continued, and then he looked out and said: "We must have the car opened nowplease smile and bow as we go through the villages when any of the old people curtsey to you; the young ones won't do it, I expect, but my mother's old friends may.

2 adjectives to describe  speechlessness