abrumadora

adj. crushing, overpowering; exhausting; tiresome; killing (figurative)

= boggling, mind-boggling [mind boggling], overwhelming, taxing, devastating, mind-numbing.
Ex: It's utterly boggling and that's not an isolated incident, I can cite you several more from last week.
Ex: The new technologies for information storage and retrieval which have burst upon the scene in only the past few years are mind boggling.
Ex: Although the overwhelming majority of technologically-driven programmes disregard information problems and issues, there are encouraging signs of a growing awareness of the need for information-driven.
Ex: It is difficult to remember the special interests of more than a few people, and hence rather taxing to provide SDI manually to more than a handful of users.
Ex: Such examples are to be found time and time again in LCSH, and the psychological effect on the user must be devastating.
Ex: Librarians, led by men like Melvil Dewey, spent the majority of their waking hours attempting to reduce library work to a 'mechanical art', and their mind-numbing articles weighed heavily upon the pages of 'Library Journal'.
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* de forma abrumadora = overwhelmingly.