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arduous

ar·du·ous

arduous

 
 
pronunciation:
ar ju ihs
part of speech: adjective
definition 1: entailing great difficulty, exertion, or endurance; laborious.
Constructing the huge statue was an arduous task.
synonyms:
difficult, formidable, hard, laborious, troublesome, uphill
antonyms:
easy, effortless, facile, light
similar words:
ambitious, burdensome, grueling, heavy, herculean, onerous, rough, strenuous, trying
definition 2: of great energy or vigor; strenuous.
The battle had been arduous and there were heavy losses on both sides.
synonyms:
energetic, strenuous, strong, vigorous
antonyms:
sluggish
similar words:
grueling, herculean, powerful, tireless
definition 3: difficult to climb; steep.
synonyms:
acclivitous, steep, uphill
similar words:
abrupt, bluff, precipitous, sheer
derivations: arduously (adv.), arduousness (n.)