uncholeric
/ʌnˈtʃɒlɛrɪk/Definitions
1. adjective
not choleric; not prone to anger or irritability
“The doctor noted that the patient was uncholeric, which made it difficult to diagnose the condition.”
2. noun
a person who is not choleric; a person who is not prone to anger or irritability
“The patient’s uncholeric nature made him a challenge to work with, as he rarely got angry.”