Definition of arduous

acrimonious Definition: (adjective) biting, harsh, caustic. Petersons.com

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ar·du·ous    (ärj-s) KEY  

ADJECTIVE:

1. Demanding great effort or labor; difficult: "the arduous work of preparing a Dictionary of the English Language" (Thomas Macaulay).
2. Testing severely the powers of endurance; strenuous: a long, arduous, and exhausting war.
3. Hard to traverse, climb, or surmount. See Synonyms at burdensome, hard.

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ETYMOLOGY:
From Latin arduus, high, steep

OTHER FORMS:
ardu·ous·ly (Adverb), ardu·ous·ness (Noun)

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