Boundless 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 context, 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.

無限 is the Chinese and Japanese word meaning infinity, unlimited or unbounded.

無限 literally translates as "without limits" or "without [being] bound."

The first character means "never" or "not" or like a prefix "un-."

The second means "limited," "restricted," or "bound."

Please note that the Japanese definition leans more toward "infinity" and the Chinese is more about being "boundless" or "without limits."

In Korean, this means infinity, infinitude, or boundlessness. But in Korean, this term has many interpretations or contexts, so your intended meaning might come out a little vague or ambiguous.

漫瀾 is the Chinese, Japanese Kanji, and old Korean Hanja for, "Having no boundaries or limitations."

This literally talks of the vastness of an ocean or river.

Character breakdown:
漫 = free; unrestrained; to inundate; overflowing; boundless.
澜 = swelling water; large wave.