The term "informational abyss" can refer to a lack of resources or knowledge on a particular topic. Synonyms for this phrase could include "information desert," "information void," or "information blackout." Another similar phrase could be "information deficit," which implies a shortage of available information. Alternatively, one could use the phrase "knowledge gap" to refer to a lack of understanding or comprehension. "Information drought" or "information vacuum" could also be used to describe a dearth of information. Ultimately, these synonyms highlight the importance of ensuring that accurate and reliable information is readily available to those who seek it, rather than allowing individuals to be left in an "informational abyss".