incommunicable

/IH0 N K AH0 M Y UW1 N AH0 K AH0 B AH0 L/
adjective
  1. 1

    (of a disease etc) That cannot be communicated or transmitted

  2. 2

    (of a person) Who does not communicate freely; uncommunicative or reserved

Antonyms

Source: https://en.wiktionary.org/wiki/incommunicable