taxing Synonyms

onerous burdensome back-breaking superincumbent tasking taxed taxability taxation testing superincumbency stretching stressful strenuous severe serious saddling sad rugged thorny tiring unbearable gruelling grueling backbreaking worrisome weighty wearying wearing uphill trying troublesome tough tolling toilsome toilful tithe rough rigorous draining disturbing dire difficult demanding delation debilitating cruel consuming complicated charging challenging