hard, arduous, laborious, strenuous, trying, robust

harsh, cruel, severe, hard, tough, ruthless

tough, harsh, hard, rough, severe, drastic

strict, rigorous, tough, rigid, firm, hard

tough, hard, strict, stringent, severe, stern

rigid, solid, static, hard, indeclinable, immobile

difficult, hard, troublesome, severe, uphill, intractable

exorbitant, steep, burdensome, hard, extortionate, fulsome

hard

hard, hardy

hard

copious, profuse, superabundant, abundant, plenteous, hard

hard, solid, firm, stiff, concrete, inflexible

realistic, pragmatic, actual, factual, de facto, hard

hard

tenaciously, hard

carefully, hard

hard

hard

excessively, exceedingly, unduly, overmuch, extremely, hard