daḷha : [adj.] firm; strong; steady.

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

Daḷha (adj.) [Sk. dṛḍha to dṛhyati to fasten, hold fast; *dhergh, cp. Lat. fortis (strong). Gr. tarfu/s (thick), Lith. dir̃žas (strap). For further relations see Walde, Lat. Wtb. under fortis] firm, strong, solid; steady, fast; nt. adv. very much, hard, strongly -- D i.245; S i.77; A ii.33; Sn 321 (nāvā), 357, 701, 821 (˚ŋ karoti to strengthen), 966 (id.); Dh 112; J ii.3; iv.106; DhA iv.48; KhA 184; VvA 212 (=thira); PvA 94, 277. -- daḷhaŋ (adv.) Dh 61, 313.
   -- dhamma strong in anything, skilled in some art, proficient S ii.266=A ii.48 (of an archer); M i.82; J vi.77; Vv 631 acc. to Trenckner, Notes p. 60 (cp. also VvA 261)=dṛḍha -- dhanva, from dhanu=having a strong bow; -- nikkama of strong exertion Sn 68 (=Nd2 294); -- parakkama of strong effort, energetic M ii.95; A ii.250; Dh 23; Th 2, 160; -- pahāra a violent blow J iii.83; -- pākāra (etc.) strongly fortified S iv.194; -- bhattin firmly devoted to somebody DhsA 350.

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

daḷha: a. 堅固

巴漢辭典 編者：(斗六) 廖文燦