אולטימטיבי

Borrowed from German ultimativ, from Medieval Latin ultimātus (“furthest, last”), past participle of Latin ultimō, ultimāre (“to come to an end”), from ultimus (“last, final”). Compare אוּלְטִימָטוּם (“ultimatum”).

Further reinforced by English ultimate.

אוּלְטִימָטִיבִי • (ultimatívi) (feminine אוּלְטִימָטִיבִית, masculine plural אוּלְטִימָטִיבִים, feminine plural אוּלְטִימָטִיבִיּוֹת)

1. Ultimate: maximum, most extreme.
2. (colloquial) best, most fitting

   זו מכונת הכביסה האולטימטיבית בשבילנו. ― It's the best washing machine for us.