Sentence:  ... he saw him arrive with his usual florid appearance: had he come pale and <WSD>sickly</WSD>, Sandford had been kind to him; but in apparent good health and spirits, he could not form his mouth to tell him he was “glad to see him.” 
Meaning of the word marked with <WSD> tags:  Appearing ill, infirm or unhealthy; giving the appearance of illness.