1.
dry
Not wet; lacking moisture. Used for hair, weather, beverages, and other physical contexts.
2.
unemotional, detached, businesslike
Describes a person or attitude that is cool, rational, and unsentimental. Implies someone who does not let emotions influence decisions or relationships.
Usage
Sense 2 is particularly common in Japanese. Calling someone ドライ is not necessarily negative — it can mean admirably rational. However, it can also imply coldness or a lack of human warmth depending on context.
Similar words
The opposite of ドライ (sense 2) is ウェット, which describes someone sentimental and emotionally attached. This ドライ／ウェット contrast is a common way to describe personality types in Japanese.