operose
61onerous — oner·ous / ä nə rəs, ō / adj 1: excessively burdensome or costly 2: involving a return benefit, compensation, or consideration an onerous donation used chiefly in the civil law of Louisiana see also onerous contract at …
62oppressive — I adjective afflictive, arduous, burdensome, confining, cruel, crushing, cumbersome, cumbrous, depressing, detrimental, devouring, difficult, difficult to bear, distressing, engulfing, exacting, exhausting, fatiguing, formidable, galling,… …
63plodding — index operose, painstaking, patient, pedestrian, pertinacious, stable, steadfast Burton s Legal Thesaurus. William C. Burton …
64Sisyphean — index operose Burton s Legal Thesaurus. William C. Burton. 2006 …
65straining — index operose Burton s Legal Thesaurus. William C. Burton. 2006 …
66strenuous — index difficult, intense, intensive, onerous, operose, oppressive, painstaking Burton s Legal Thesaurus. William C. Burton …
67tiresome — index irksome, jejune (dull), lifeless (dull), operose, painful, pedestrian, prolix …
68tiring — index irksome, operose, oppressive Burton s Legal Thesaurus. William C. Burton. 2006 …
69toilsome — index onerous, operose, oppressive Burton s Legal Thesaurus. William C. Burton. 2006 …
70troublesome — index difficult, froward, invidious, irksome, operose, oppressive, painful, perverse, problematic …
