The term 'very intelligent' can be described by two crossword solutions: 'SMART' (5 letters) and 'SMART as a whip' (12 letters). The term 'SMART' is often used to describe someone who is quick-witted, has good judgement, and is able to think critically. The phrase 'SMART as a whip' is an idiom that means someone is very intelligent and quick-thinking. It is derived from the idea that a whip is a tool that requires skill and precision to use effectively.