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