burdensome

bur·den·some  (bûrdn-sm)

adj.

Of or like a burden; onerous.

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burden·some·ly adv.

burden·some·ness n.

Synonyms: burdensome, onerous, oppressive, arduous, demanding, rigorous, exacting
These adjectives apply to what imposes a severe test of bodily or spiritual strength. Burdensome is associated with both mental and physical hardship: The burdensome task of preparing her tax return awaited her.
Onerous connotes the figuratively heavy load imposed by something irksome or annoying: My only onerous duty was having to greet the guests.
Something oppressive weighs one down in body or spirit: "Old forms of government finally grow so oppressive that they must be thrown off" (Herbert Spencer).
Arduous emphasizes the expenditure of sustained and often exhausting labor: Becoming a doctor is an arduous undertaking.
Demanding, rigorous, and exacting imply the imposition of severe and uncompromising demands: Music is a demanding art. "Yet out of this unflattering, rigorous realism . . . Swift made great art" (M.D. Aeschliman). Archaeology is exacting work.

Thesaurus

Adj.

1.

burdensome - not easily borne; wearing; "the burdensome task of preparing the income tax return"; "my duties weren't onerous; I only had to greet the guests"; "a taxing schedule" onerous, taxing heavy - marked by great psychological weight; weighted down especially with sadness or troubles or weariness; "a heavy heart"; "a heavy schedule"; "heavy news"; "a heavy silence"; "heavy eyelids"

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burdensome

adjective troublesome, trying, taxing, difficult, heavy, crushing, exacting, oppressive, weighty, onerous, irksome