One of the agents with a picket of a few of our blacks, armed for the purpose, was keeping guard over the ivory; but deep within the forest, red gleams that wavered, that seemed to sink and rise from the ground amongst confused columnar shapes of intense blackness, showed the exact position of the camp where Mr. Kurtz’s adorers were keeping their uneasy vigil.
There are no more uses of "waver" in the book.
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Through good times and bad her love for him has never wavered.
We are looking for someone who won’t waver when things get tough.