Meanings of altogether unmingled in English

I looked on, I thought, I reflected, I admired, in a state of stupefaction not altogether unmingled with fear!

There was a look of concern, not altogether unmingled with amusement, in his expression as he rose and advanced to meet them.

The tone of surprise, not altogether unmingled with contempt, with which this was uttered by Mrs. Minturn, put Erskine a little on his guard.

There was, however, a crunching sound which indicated great power, and drew from Mrs Marrot an exclamation of surprise not altogether unmingled with alarm.