taking too much for granted; presumptuous.

1595–1605; assume + -ing2

assumingly, adverb
self-assuming, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
assuming (əˈsjuːmɪŋ)
1.  expecting too much; presumptuous; arrogant
2.  (often foll by that) if it is assumed or taken for granted (that): even assuming he understands the problem, he will never take any action

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

mid-15c., "to receive up into heaven" (especially of the Virgin Mary, e.g. Feast of the Assumption, celebrated Aug. 15, attested from c.1300), from L. assumere "to take up," from ad- "to, up" + sumere "to take," from sub "under" + emere "to take" (see exempt). Early pp. was
assumpt. Meaning "to suppose" is first recorded 1590s. In rhetorical usage, assume expresses what the assumer postulates, often as a confessed hypothesis; presume expresses what the presumer really believes.
Online Etymology Dictionary, © 2010 Douglas Harper
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