Endless in Chinese / Japanese...

無窮 is the Chinese and Korean word meaning infinity, eternity, infinitude, infinite or endless.

無窮 literally translates as “without [ever becoming] exhausted/poor,” and in that context, can mean “inexhaustible” or “boundless” but this is usually read as “without end.” Some extended definitions include eternity, infinitude, or immortality.

In certain contexts, it can mean “immortality.”

The first character means “never” or “not.” The second means “exhausted,” “finished,” or “ending.”

Note: 無窮 is a Japanese word but rarely used in modern Japan.

輪廻 is one of a few ways to express संसार or Saṃsāra in Chinese, Japanese, and old Korean.

The Buddhist term can be translated in several ways, including:
An endless cycle of death and rebirth.
The turning of the wheel.
To revolve.
Transmigration in six ways.
The wheel of transmigration.
The round of existence.

無盡 is the Chinese, Japanese Kanji, and old Korean Hanja for endless; inexhaustible; without limits; infinite.

In the Buddhist context, this can refer to the infinitude of living beings, of worlds, of space, of the dharmadhātu, of nirvāṇa, etc.

輪廻転生 is a Japanese Zen quote or proverb that expresses the idea of all things being in flux through the endless circle of birth, death, and rebirth or the circle of transmigration.