Ukkūla (adj.) [ud + kūla] sloping up, steep, high (opp. vikkūla) A i.35 sq.; Vism 153 (nadi); SnA 42. Cp. utkūlanikūla -- sama Lal. V. 340.

Pali-English Dictionary, TW Rhys Davids, William Stede,

ukkūla : [adj.] steep; sloping up.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]