The Collaborative International Dictionary
Burdensome \Bur"den*some\, a. Grievous to be borne; causing uneasiness or fatigue; oppressive.
The debt immense of endless gratitude
So burdensome.
--Milton.
Syn: Heavy; weighty; cumbersome; onerous; grievous; oppressive; troublesome. [1913 Webster] -- Bur"den*some*ly, adv. -- Bur"den*some*ness, n.
Wiktionary
adv. In a burdensome fashion.
Usage examples of "burdensomely".
The good-humored, friendly crinkles about his eyes were white with tension and oily with grime as he kept unrolling an interminable bandage around the bulky cotton compress Yossarian felt strapped burdensomely to the inside of one thigh.
He is indeed rather tubby now, the back resting burdensomely on the buttocks, and he walks with an effortful, cross-footed gait.