无限

unlimited / unbounded

not to have / no / none / not / to lack / un- / -less

to limit / to restrict / (bound form) limit / bound

indefinitely; of unlimited duration

semi-infinite

infinitesimal / infinite decimal expansion

infinitesimal / infinitely small

The boundless vista is at the perilous peak (proverb) / fig. exhilaration follows a hard-won victory

limitless / unrestricted