(p. pr. & vb. n.) of Demand.

Herculean Spartan Spartanic abstruse accurate arduous astringent attentive austere authoritarian brutal burdensome cajoling clamant clamorous close coaxing complex conscientious correct critical crying delicate detailed difficile difficult dour draining dunning exact exacting exigent exorbitant exquisite extortionate fine finical finicking finicky formidable fussy grasping grievous grim hairy hard hard-earned hard-fought harsh imperative importunate insistent instant intricate jawbreaking knotted knotty laborious loud mean meticulous minute nagging narrow nice no picnic not easy operose oppressive particular persistent pertinacious pestering plaguing precise precisianistic precisionistic pressing punctilious punctual refined religious rigid rigorous rough rugged scrupulous scrutinizing set with thorns severe spiny steep stern strenuous strict stringent subtle taxing teasing thorny ticklish toilsome tough tricky trying unsparing uphill urgent weighty wheedling wicked