Assiduous

As*sid"u*ous (?), a. [L. assiduus, fr. assid?re to sit near or close; ad + sedēre to sit. See Sit.] 1. Constant in application or attention; devoted; attentive; unremitting.

She grows more assiduous in her attendance.
Addison.

2. Performed with constant diligence or attention; unremitting; persistent; as, assiduous labor.

To weary him with my assiduous cries.
Milton.

Syn. -- Diligent; attentive; sedulous; unwearied; unintermitted; persevering; laborious; indefatigable.

As*sid"u*ous*ly, adv. -- As*sid"u*ous*ness, n.