presumptuous
adjective
full of, characterized by, or showing presumption or readiness to presume in conduct or thought, as by saying or doing something without right or permission.
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Grasping the conception of one God, who creates, rules, and loves all, man may unpresumptuously feel himself to be a child of the Infinite and a safe heir of immortality.
From The Destiny of the Soul A Critical History of the Doctrine of a Future Life by William Rounseville Alger