Lewis & Short

magnŏpĕrē (so written by Plaut., Cæs., Liv., and Sen., but ap. Ter., Cic., Plin. H. N., the best MSS. and edd. have magnō opĕre; cf. Ellendt, Cic. de Or. 1, 35, 164; Osann, Cic. Rep. 1, 8, 13), adv. [magnus-opus, with great labor; hence, in gen.], very much, greatly, exceedingly, particularly, earnestly.

  1. A. With verbs and verbal adjj., etc. (class.): edictum est magnopere mihi, ne, etc., Plaut. Pers. 2, 2, 59: L. Gellius philosophis magno opere auctor fuit, ut, etc., Cic. Leg. 1, 20, 53: ego tibi Romam properandum, magno opere censeo, id. Fam. 15, 14, 4; id. de Or. 2, 86, 353: desidero, id. Sen. 13, 44: nullā magnopere clade acceptā, Liv. 3, 26.
    Esp., with words denoting mental action, as velle, petere, orare, hortari, desiderare, mirari, etc., strongly, vehemently, with all one’s heart, zealously: hoc etiam magnopere oravit, ut, etc., Suet. Ner. 57: magno opere velle, Cic. Fam. 2, 6, 1: magnopere cohortatus, Caes. B. G. 2, 5: suadere, Liv. 3, 71, 8: desiderare, Cic. Lael. 13, 44: mirari, id. Off. 2, 16, 56; so with putare, censere, providere, etc., strongly, earnestly: putare, id. Fam. 6, 13, 12: censeo, id. ib. 15, 14, 6; Liv. 3, 18, 3: quā de re, judices, vobis magno opere providendum est, Cic. Verr. 2, 2, 10, § 28; cf.: nulla magno opere expectatio est, no very great, Cael. ap. Cic. Fam. 8, 1.
    In tmesi: magnoque opere abs te peto, cures, ut, etc., Cic. Fam. 13, 34.
    In the contrary order: opere magno edicite, ut etc., Att. ap. Non. 357, 13 (Trag. Rel. v. 508 Rib.).
    In comp.: quo majore opere dico suadeoque, uti, etc., the more, Cato ap. Gell. 7, 3, 4.
    In sup.: meministin’ mihi te maximopere dicere? Ter. Heaut. 4, 1, 13: a te maximo opere etiam atque etiam quaeso et peto, ut, etc., most particularly, Cic. Fam. 3, 2, 1: maximopere indigne ferens, Liv. 42, 57.
    In tmesi: Thais maximo te orabat opere, Ter. Eun. 3, 3, 26.
    In inverted order: rogare jussit te opere maximo, Plaut. Stich. 1, 3, 94: nos ambo opere maximo dabamus operam, ut, etc., Ter. Phorm. 5, 1, 33.
  2. B. With adjectives = valde (very rare): id ego Tadio et gratum esse intellexi et magno opere jucundum, Cic. Att. 1, 8, 1.