from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Difficult to understand; recondite. See Synonyms at ambiguous.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Concealed or hidden out of the way.
  • adj. Remote from apprehension; difficult to be comprehended or understood; recondite.

from The Century Dictionary and Cyclopedia

  • Withdrawn from view; out of the way; concealed.
  • Remote from comprehension; difficult to be apprehended or understood; profound; occult; esoteric: opposed to obvious.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge


Latin abstrūsus, past participle of abstrūdere, to hide : abs-, ab-, away; see ab-1 + trūdere, to push; see treud- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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  • abstract

    March 24, 2013

  • "The Frost performs its secret ministry,
    Unhelped by any wind. The owlet's cry
    Came loud--and hark, again ! loud as before.
    The inmates of my cottage, all at rest,
    Have left me to that solitude, which suits
    Abstruser musings : save that at my side
    My cradled infant slumbers peacefully.
    'Tis calm indeed ! so calm, that it disturbs
    And vexes meditation with its strange
    And extreme silentness."

    - Samuel Taylor Coleridge, Frost at Midnight.

    December 22, 2008