Compare to Philip Marlowe in thoughtful when you are not thinking.
Saarinen, an exceptionally slow talker, was being interviewed for a television program. The allotted time was rapidly running out, and the anxious interviewer ventured to ask Saarinen if he could speak just a little faster. "No, sir," replied the architect, casually lighting up his pipe. "But," he continued, more slowly than ever, "I could say less."