burdensome, demanding, enervating, exacting, heavy, onerous, punishing, sapping, stressful, tiring, tough, trying, wearing, wearisome
easy, easy-peasy (slang) effortless, light, unburdensome, undemanding
English Collins Dictionary - English synonyms & Thesaurus
A taxing task or problem is one that requires a lot of mental or physical effort. adj
It's unlikely that you'll be asked to do anything too taxing.
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