ψιλωτέον
From LSJ
σκληρόν σοι πρὸς κέντρα λακτίζειν → it is hard for thee to kick against the pricks, it is hard for you to kick against the goads
English (LSJ)
A one must write or pronounce with the spiritus lenis, Sch.Il.1.335, etc.
Greek (Liddell-Scott)
ψῑλωτέον: ῥημ. ἐπίθ., πρέπει τις νὰ μεταχειρισθῇ ψιλήν, Σχολ. εἰς Ἰλ. Α.335, κλπ.