συνθαυμάζω
From LSJ
Περὶ τοῦ ἐπέκεινα τοῦ νοῦ κατὰ μὲν νόησιν πολλὰ λέγεται, θεωρεῖται δὲ ἀνοησίᾳ κρείττονι νοήσεως → On the subject of that which is beyond intellect, many statements are made on the basis of intellection, but it may be immediately cognised only by means of a non-intellection superior to intellection
English (LSJ)
A join in wondering, εἰ . .v.l. in Pl.Tht.162c; join in admiring, τὴν ἀκρίβειαν Eun.VS p.469 B.