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

  • adj. Constant in application or attention; diligent: an assiduous worker who strove for perfection. See Synonyms at busy.
  • adj. Unceasing; persistent: assiduous research.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Hard-working, diligent or regular (in attendance or work); industrious.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Constant in application or attention; devoted; attentive; unremitting.
  • adj. Performed with constant diligence or attention; unremitting; persistent.

from The Century Dictionary and Cyclopedia

  • Constant in application; attentive; devoted: as, a person assiduous in his occupation; an assiduous physician or nurse.
  • Constant; unremitting: applied to actions.
  • Synonyms Sedulous, diligent, active, busy, constant, patient, persevering, laborious, unceasing, indefatigable, untiring. See assiduity.

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

  • adj. marked by care and persistent effort


From Latin assiduus, from assidēre, to attend to : ad-, ad- + sedēre, to sit; see sed- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin assiduus, from assidere ("to sit down to"), from ad- ("to") + sedere ("to sit"). (Wiktionary)



Log in or sign up to get involved in the conversation. It's quick and easy.

  • Really? I always thought it sounded like the taste of lemons.

    May 1, 2011

  • This word sounds like tiny waves taking over a beach.

    April 30, 2011

  • The assiduous merchant, the laborious husbandman, the active mechanic, and the industrious manufacturer - all orders of men look forward with eager expectation and growing alacrity to the pleasing reward of their toils.

    September 16, 2010

  • Citation on fungus garden.

    December 5, 2008