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1. Impossible to dispute or disprove; undeniable: unassailable truths.
2. Not subject to attack or seizure; impregnable: an unassailable fortress.

un′as·sail′a·bil′i·ty, un′as·sail′a·ble·ness n.
un′as·sail′a·bly adv.
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.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.unassailably - in an unalterable and unchangeable mannerunassailably - in an unalterable and unchangeable manner; "his views were unchangeably fixed"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
We take it in under the impression it is unassailably true because it's in a book and teacher tells us about it.
There is also a pragmatic recognition in Gulf capitals of the benefits of security, technological and economic links with an unassailably powerful Israel -- not only for their own sake, but also because of the US approval that brings, Israel sees ties with the Gulf as an important way of demonstrating its own influence in Washington.
They were masters of the rules, or unassailably knowledgeable about a given issue, or supremely watchable orators.
if Professor Raoul Berger should demonstrate unassailably that [Marbury]
The Azibo Nosology plainly situates itself in African personality theory normalcy via interpretability only in deviation from or distortion of the correct orientation construct which is explicitly based in consubstantiating "Spirit." Thus, it is unassailably tied to ADP intergenerationally, as in vertical self-extension, and communally, as in horizontal self-extension.
They also have an unassailably public ethos, a particular air of credibility, trustworthiness, and integrity that people have come to associate with programs like Sesame Street.
The duo also combined for at least four kill blocks as the Perlas Spikers went unassailably ahead at 13-2.
Shiferaw is a highly appealing figure, and the youngsters playing Zain and Yonas are unassailably cute, creating an engine of sweet comedy and pathos that sustains the film.
It is unassailably clear that there is still much work to be done for our industry to mirror the demographic diversity emerging in the early 21st century in the U.S.
Unassailably, much more needs to be done in Nigeria's vineyard of absolute security redemption.
But the bottom line is indisputable: As shaped by Villeneuve and his masterful creative team, especially production designer Dennis Gassner and cinematographer Roger Deakins, this film puts you firmly, brilliantly, unassailably in another world of its own devising, and that is no small thing.
Authoritatively named and unassailably daring, The History of White People started with a question; it is worth reading the memoir just to learn about the stunning process that spawned the book.