incommunicable
adjective
[ ɪnkəˈmjuːnɪkəb(ə)l ]
• not able to be communicated to others.
• "the pain of separation took the form of an incommunicable depression"
Similar:
indescribable,
inexpressible,
unutterable,
unspeakable,
undefinable,
ineffable,
beyond words,
beyond description,
overwhelming,
intense,
profound,
Origin:
mid 16th century (in the sense ‘incommunicative’): from late Latin incommunicabilis ‘not to be imparted’, from in- ‘not’ + communicabilis (see communicable).