1. able to be comprehended or grasped mentally
2. reasonable or natural in a particular situation

Examples

• The teacher’s explanation was clear and understandable.
• His anger was understandable given the circumstances.
• The instructions need to be written in understandable language.
• It’s understandable that she feels nervous about the interview.
• The diagram makes the process more understandable.
• Her reaction was completely understandable.
• The book is written in an understandable way for beginners.