undesigning

un·de·sign·ing

 (ŭn′dĭ-zī′nĭng)
adj.
Having no ulterior motives; straightforward.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

undesigning

(ˌʌndɪˈzaɪnɪŋ)
adj
(of a person) frank; straightforward
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

un•de•sign•ing

(ˌʌn dɪˈzaɪ nɪŋ)

adj.
not given to underhand schemes or selfish motives; without an ulterior design.
[1665–75]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Translations
References in classic literature ?
Once received, it is a haunting idea; how many undesigning persons I suspected of watching me, it would be hard to calculate.
Forgetful of all other things in the ecstasy of the moment, his face flushed and his eyes sparkling with delight, heedless of the weight of the great banner he carried, and mindful only of its flashing in the sun and rustling in the summer breeze, on he went, proud, happy, elated past all telling:--the only light-hearted, undesigning creature, in the whole assembly.
When he deems Mr Venus's wheels sufficiently lubricated, Mr Wegg approaches his object by asking, as he lightly taps his hands together, to express an undesigning frame of mind:
As to marriage, and fortune, and all that, I believe I was almost as innocently undesigning then, as when I loved little Em'ly.
It seemed to me that his off-hand professions of childishness and carelessness were a great relief to my guardian, by contrast with such things, and were the more readily believed in since to find one perfectly undesigning and candid man among many opposites could not fail to give him pleasure.