Based on or characterized by assumption; tending to assume or take things for granted without proof.
From 'assumption' plus '-ive' (the adjectival suffix meaning 'tending to' or 'relating to'). This follows the pattern of 'active,' 'creative,' 'productive'—creating an adjective that means either 'relating to' or 'characterized by' the root noun.
In theology, 'assumptive' has a specific meaning: relating to the Assumption of Mary. But more interestingly, in linguistics and psychology, 'assumptive world' is a technical term for the unconscious set of beliefs and expectations that structure how we interpret reality—your assumptive world literally determines what you notice!
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