(adj.Adj.adv.) : fĭdēlis, e, adj.1. fides
* That may be trusted or relied upon, trusty, faithful, sincere, true (class.; syn. fidus).
* Prop.
* Adj., constr. absol., with dat., or with in and acc.
* Transf., in gen., of things, to be depended upon, sure, safe, strong, firm, durable (rare but class.): nam et doctrina et domus, et ars et ager etiam fidelis dici potest: ut sit, quomodo Theophrasto placet, verecunda tralatio,Cic. Fam. 16, 17, 1: in nave tuta ac fideli,id. Planc. 41, 97: lorica,Verg. A. 9, 707: portus,Ov. Tr. 4, 5, 5: materies terebinthi ad vetustatem,Plin. 13, 6, 12, § 54; structura,Front. Aquaed. 123: rimis explendis fidelior pice,Plin. 16, 36, 64, § 158: fidelissimum glutinum,id. 28, 17, 71, § 236.—Hence, adv., in two forms: fĭdē-lĭter (class.) and fĭdēle (ante- and postclass.).
* Faithfully, trustily, certainly, surely, honestly.
* With in and acc.: quam fideli animo et benigno in illam fui,Ter. Hec. 3, 5, 22; cf. Cic. Mil. 10, 29: in amicos,Sall. C. 9, 2 (others read: in amicis, v. Kritz. ad h. 1.).
* Subst.: fĭdēlis, is, m., a trusty person, a confidant: si quem tuorum fidelium voles, ad me mittas,Cic. Fam. 4, 1, 2.
* Form fideliter: constanter et fideliter in amicitia alicujus permanere,Liv. 33, 35, 9: vivere simpliciter, fideliter vitaeque hominum amice,Cic. Off. 1, 26, 92: obtestatur per sua antea fideliter acta, etc.,Sall. J. 71 fin.: aliquid fideliter curare,Cic. Att. 15, 20, 4: valetudini inservire, Tiro ap. Cic. Fam. 16, 17, 1: colere amicos,Plin. Ep. 7, 31, 5: discere artes ingenuas,Ov. P. 2, 9, 47: retinent commissa (aures),Hor. Ep. 1, 18, 70; cf.: ejus (memoriae) duplex virtus, facile percipere et fideliter continere,Quint. 1, 3, 1: exstincta parum fideliter incendia,Flor. 3, 5 med.
* Form fidele: fac fidele sis fidelis,Plaut. Capt. 2, 3, 79: militare, Prud. στεγ. 10, 428.
* Comp.: quo propior quisque est servitque fidelius aegro,Ov. M. 7, 563; Plin. Ep. 6, 24, 3.
* (Acc. to II.) Surely, strongly, firmly: per quorum loca fideliter mihi pateret iter, Planc. in Cic. Fam. 10, 23, 2: oratoris futuri fundamenta fideliter jacere,Quint. 1, 4, 5: quod fideliter firmum est, a primis statim actionibus arripere optimum est,firmly grounded,id. 6, 4, 14; cf. Gell. 15, 2, 6.—Comp.: qui quartanum passus convaluerit, fidelius constantiusque postea valiturum,Gell. 17, 12, 3: memoriae inhaerere fidelius,Quint. 10, 6, 2; cf. id. 10, 3, 2.—Sup.: fortunae inaurato fidelissime simulacro,very solidly, durably,Plin. 33, 3, 19, § 61.

s. TLL