wearisome

adjective

I can't think of anything more wearisome than traipsing round a factory all day:

tiring, exhausting, wearying, fatiguing, enervating, draining, sapping, stressful, wearing, crushing;

demanding, exacting, taxing, trying, challenging, burdensome, arduous, gruelling, punishing, grinding, onerous, difficult, hard, tough, heavy, laborious, back-breaking, crippling, strenuous, rigorous, uphill;

tiresome, irksome, weary, boring, dull, tedious, monotonous, humdrum, prosaic, unexciting, uninteresting.

▷antonyms refreshing; interesting, enjoyable.

wearisome Oxford Dictionary of English