Sentence:  Despite the bursitis, Dewey got in a good round of golf, though his cautious game inspired a reporter to make one of the week′s <WSD>unkindest</WSD> remarks: “He plays golf like he plays politics — straight down the middle, and short.” 
Meaning of the word marked with <WSD> tags:  Lacking kindness, sympathy, benevolence, gratitude, or similar; cruel, harsh or unjust; ungrateful. (From mid-14thC.)