unsharable
/ˌʌnˈʃɛrəbəl/Definitions
1. adjective
Impossible to share or communicate; not able to be shared or communicated.
“The artist considered the unsharable emotions depicted in her latest painting to be her most personal work.”
2. noun
A quality or feeling that is difficult to share or convey.
“The unsharable sense of loss was palpable in the room.”