漫無邊際

1. • extremely vast
2. • boundless
3. • limitless
4. • digressing
5. • discursive
6. • going off on tangents
7. • straying far off topic

Character by character

• 漫(màn)free
• 無(wú)not to have
• 邊(biān)side
• 際(jì)border