1. unable to be communicated, expressed, or shared with others
Usage: formal; often used to describe feelings, experiences, or knowledge that are difficult or impossible to convey
2. not willing or able to communicate; uncommunicative
Usage: less common; describes a person or their nature

Examples

• The artist struggled to express the incommunicable beauty of the landscape in words.
• Some spiritual experiences are considered incommunicable to those who have not lived them.
• The grief she felt was so profound and incommunicable that she withdrew from her friends.
• His incommunicable nature made it difficult for colleagues to understand his intentions.
• The incommunicable essence of music lies in its ability to move us beyond language.
• Certain mathematical truths remain incommunicable without the proper symbolic framework.