kasira : [adj.] miserable; difficult. (nt.), misery; trouble; difficulty.

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

Kasira (adj.) [Probably fr. Vedic kṛcchra, the deriv. of which is uncertain] miserable, painful, troubled, wretched A iv.283; Sn 574; J ii.136; iv.113=vi.17; Pv iv.121 (=PvA 229 dukkha). -- adv. kasirā (abl.) with difficulty J v.435; -- kasirena (instr.) D i.251; M i.104; S i.94; Vin i.195; J i.338; iii.513. a˚ without pain, easy, comfortable J vi.224 (=niddukkha); -- lābhin obtaining without difficulty (f˚ inī A iv.342) in formula akicchalābhī akasiralābhī etc. M i.33; S ii.278; A i.184; ii.23, 36; iv.106; Ud 36; Pug 11, 12.  -- ābhata amassed with toil and difficulty (of wealth) J v.435; -- vuttika finding it hard to get a livelihood A i.107=Pug 51.

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

kasira: a. 困苦

巴漢辭典 編者：(斗六) 廖文燦