The term 'quick-sighted' is an adjective used to describe someone who has an ACUTE ability to observe and understand things quickly. The crossword solutions for this term are 'ACUTE, ' which is a five-letter word meaning sharp or keen. This term is often used to describe someone's mental or physical senses, such as sight, hearing, or smell. It can also be used to describe someone's ability to think quickly and accurately. In other words, someone who is quick-sighted is able to take in information quickly and make decisions based on that information.