He has assiduously courted key figures in the Republican establishment.
He has taken care of the little guy, assiduously bringing home federal bucks to his impoverished district.
The assistant principal circles her, arms outstretched as if in a linebacker drill, but assiduously avoiding contact.
1530s, from Latin assiduus "attending; continually present, incessant; busy; constant," from assidere "to sit down to," thus "constantly occupied" at one's work; from ad "to" (see ad-) + sedere "to sit" (see sedentary). The word acquired a taint of "servility" in 18c. Related: Assiduously; assiduousness.