This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Marked by persevering, painstaking effort. See Synonyms at busy.

adj. Performing with intense concentration, focus, responsible regard.

adj. Prosecuted with careful attention and effort; careful; painstaking; not careless or negligent.

adj. Interestedly and perseveringly attentive; steady and earnest in application to a subject or pursuit; assiduous; industrious.

Constant in study or effort to accomplish what is undertaken; attentive and persistent in doing anything; industrious; assiduous.

Steadily applied; prosecuted with care and constant effort; careful; painstaking: as, make diligent search.

Synonyms Active, sedulous, laborious, persevering, indefatigable, unremitting, untiring, painstaking.

Diligently.

adj. quietly and steadily persevering especially in detail or exactness

adj. characterized by care and perseverance in carrying out tasks

"Thus, in the example -- "He writes _well_," the adverb shows the manner in which the writing is performed; in the examples -- "He is remarkably diligent" and "He works very faithfully," the adverbs modify the adjective _diligent_ and the other adverb _faithfully_ by expressing the degree of diligence and faithfulness."

patient    hardworking    industrious    assiduous    sedulous   

industrious    constant   

diligence   

laborious    attentive    industrious    assiduous    sedulous   

industrious    attentive    zealous    vigilant    laborious