The phrase "adequately grasp" is correct and usable in written English.
You can use it when discussing someone's understanding or comprehension of a concept or subject matter.
Example: "It took me some time to adequately grasp the complexities of quantum physics."
Alternatives: "fully understand" or "comprehend sufficiently".
Black art is the lifeline that sustains movements and makes sense of the moments theory cannot adequately grasp.
At the news conference, Mr. Paulson said growing market problems were caused by a series of factors, including mortgage brokers who pushed risky loans on homeowners, conflicts of interest at credit-rating agencies, bond underwriters that loosened standards, and financial institutions that failed to adequately grasp the riskiness of the instruments they were buying and selling.
To adequately grasp Leibniz's view one must understand that his ontology countenances different levels or degrees of reality.
In both works he holds that Aristotle was led to propose his erroneous arguments as a result of a failure to adequately grasp simple eternity.
Struggles for recognition only entangle us ever deeper in a wrong dependency on power relations the workings of which we fail to adequately grasp.
The management of this complication with a conventional forceps is difficult because the forceps often cannot adequately grasp the optic or haptic to fixate the IOL to the sclera or iris or remove it.
Vieira de Mello had come to understand what American planners had not adequately grasped before invading Iraq: outsiders almost never get the chance to revise a first impression.
This capacity for killing in numbers nothing short of the infinite cannot be adequately grasped by statistics concerning past war-making and killing.
Many of Leibniz's core concepts and principles can only be adequately grasped through the intellect, not through the senses or the imagination (see Leibniz's remarks on force in De Ipsa Natura (G 4 508; AG:159)).
For instance, if a person adequately grasps the concept "knowledge", then, for the most part, her intuitive judgments about whether a person knows, or does not know, in various scenarios will be correct.
Implicit in Mill and explicit in Frege is the claim that these descriptions are constitutive of the meaning of the term in the following way: someone who understands the term adequately will be in a position to grasp a priori that something falls under the kind term if and only if it satisfies that description.
