1. Concealed or hidden; complex, obscure, and difficult to understand: The poetry of Harry Philips was often described as
abstruse and so it was often relegated to the bottom shelf of many libraries.
2. Difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge: Some scientists may understand Einstein's theory of relativity; however, for most nonscientists, it continues to be an
abstruse collection of surrealistic or unrealistic ideas.
4. Etymology: from Latin
abstrusus, past participle of
abstrudere, "conceal"; literally, "to thrust away", from
ab-, "away" +
trudere "to thrust, to push".
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