Sentence:  Patient, always humane and trustworthy, he is personally humble at the very time that he is <WSD>rockily</WSD> steadfast (an unsympathetic witness might say stubborn), not because he fails to understand and respect the views of others but because he refuses to compromise his own enduring values. 
Meaning of the word marked with <WSD> tags:  In a manner suggestive of a rock or rocks.