perceptive
adj. C1 Advanced US //pɝˈsɛptɪv// UK //pəsˈɛptɪv// per·cep·tive
adj. having the ability to notice small details or understand things quickly. You use this to describe someone who is very smart and good at seeing the truth.
adj. having or showing the ability to notice or understand things quickly and accurately. Often describes a person's keen insight or a keen eye for detail.
She is a very perceptive student who notices small mistakes.
The manager is perceptive enough to realize that the team is struggling with the new software.
A perceptive observer might notice that the subtle changes in the landscape suggest a much older history than the official records indicate.