lui impedirglielo

prevent him from it, stop him from doing it

→ impedire
impedir to prevent, to stop + glielo to him/her + it
verb · third Rare #44,417
prevent him from it, stop him from doing it Includes the pronouns "gli" (= to him) + "lo" (= it).
IT: Non posso impedirglielo.
EN: I can't stop him from doing it.
Conjugation of impedire
impedireimpedirmeloimpedirglielo

Per anni portò gente nella Zona e nessuno riuscì a impedirglielo.

For years he brought people into the Zone and no one could stop him.

— Stalker (1979)

Devi impedirglielo, Agnes.

You have to stop him, Agnes.

— La vita straordinaria di David Copperfield (2019)

Dovete impedirglielo.

You must prevent them from doing it.

— La vita straordinaria di David Copperfield (2019)

Non offenderti, sono sempre pronti a scappare e io devo impedirglielo.

Don't be offended, they are always ready to run away and I have to stop them.

— Carandiru (2003)