Greatest Love in Chinese / Japanese...

最偉大的愛 means “the greatest love” in Chinese.

Keeping in mind that Chinese is different than English, the first character is like “-est” or adding “the most” as a modifier to the next word.
The 2nd and 3rd characters mean great, mighty, and/or large.
The 4th is a possessive article.
The last is the character for love.

When you put it all together, you get a phrase that means the greatest love, enormous love, or the mightiest love.

無限大の愛 is a Japanese title meaning infinite great love, unlimited great love, or eternal love.

無 means never, not, or like a prefix “un-.”

限 means limited, restricted, or bound.
大 means great or big.
の is a possessive article.
愛 means love or affection.