observans
From LSJ
ἔκστασίς τίς ἐστιν ἐν τῇ γενέσει τὸ παρὰ φύσιν τοῦ κατὰ φύσιν → what is contrary to nature is any developmental aberration from what is in accord with nature (Aristotle, On the Heavens 286a19)
Latin > English (Lewis & Short)
observans: antis, Part. and P. a., from observo.
Latin > French (Gaffiot 2016)
observāns,¹⁴ tis, part.-adj. de observo, qui a de la déférence, de la considération, du respect pour : [avec gén.] Cic. Quinct. 39 ; observantissimus mei homo Cic. Q. 1, 2, 11, personne pleine d’égards pour moi, cf. Cic. Fam. 13, 3, 1