Not argumentative; uninclined to argue. (adjective)
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Use "unargumentative" in a sentence
"Lady Bryan who was sensitive to her charge's willful ways and was curbing them with gentle firmness had, as a reward for dutiful and unargumentative behavior over the previous week, invited a select party to celebrate with the household."
"She would learn to be docile and unargumentative, for those two qualities seemed to be high on her husband's list of duties."
"'It might be just because every country has one, that the one in Johannesburg is not news,' Conrad murmured, in a tone a little too carefully unargumentative."