assiduous
[adjective]
Synonyms: diligent, hard-working, indefatigable, industrious, persevering, persistent, unflagging

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Antonyms: desultory
Contrasted words: casual, haphazard, happy-go-lucky, hit-or-miss, intermittent, random, careless, lax, remiss, slack, sloppy, slovenly, indolent, lazy, slothful
Related Idioms: hard at it
Related Words: hardworking, laborious, moiling, indefatigable, tireless, untiring, unwearied, zealous

[TahlilGaran] English Synonym Dictionary ▲

as‧sid‧u‧ous /əˈsɪdjuəs $ -dʒuəs/ adjective formal
[Date: 1500-1600; Language: Latin; Origin: asiduus, from assidere; ⇒ assess]
very careful to make sure that something is done properly or completely Synonym : meticulous
assiduous in
He was assiduous in his attendance at church.
—assiduously adverb:
Even young children worked assiduously for a reward.
—assiduity /ˌæsəˈdjuːəti, ˌæsɪˈdjuːəti $ -ˈduː-/ noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲