ant. rectus

[Lavrentivs]

quod ἀντωνυμία verbi rectus? (in sensu: recte dixisti etc.)

[adrianus]

quod ἀντωνυμία verbi rectus? (in sensu: recte dixisti etc.)

Personally, I don't get what you mean exactly, Laurentius.
Quid dicere velis, Laurenti, ego equidem non intelligo vel id malè capio. Visne benè dicere anglicè hoc:
"what pronoun is[?] the word 'rectus'? (in the sense of, 'you rightly said' etc.)"
Obscurum mihi est.

Adverbium est rectè vocabulum.
Rectè is an adverb.

[Sceptra Tenens]

He is asking for the antonym of rectus. There isn't one word that stands as an antonym to all of its senses. When it means "straight" or "nominative", the opposite would be obliquus. When it means "good", it would be improbus. When it means "correct", it would be falsus.

[adrianus]

Thanks, Sceptra Tenens.
Gratias tibi ago, Sceptra Tenens.

And you also have "perperàm" as an antonym for "rectè", Laurentius.
Si verbum contrarium ad "rectè" quaeras, Laurenti, et habes hoc: perperám.

"Aut recte" inquiunt "imperat pater aut perperam." (Noctes Atticae, Liber Secundus.)