His back was much bent, though he was probably not as old as he looked, but his eyes were sharp and intelligent, and belied his slow and rather cautious speech. 
He was sharp and intelligent, just like his eyes.
mnli hypothesis: He was sharp and intelligent, just like his eyes. premise: His back was much bent, though he was probably not as old as he looked, but his eyes were sharp and intelligent, and belied his slow and rather cautious speech. 