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assuming

[uh-soo-ming]
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adjective
  1. taking too much for granted; presumptuous.
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Origin of assuming

First recorded in 1595–1605; assume + -ing2
Related formsas·sum·ing·ly, adverbself-as·sum·ing, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for self-assuming

assuming

adjective
  1. expecting too much; presumptuous; arrogant
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conjunction
  1. (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
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012