没边儿没沿儿

没边儿没沿儿

Literally means:

be boundless; be elusive

Actually means:

be regardless of the reality or principle

边儿, refers to boundary between things:Yanr is the edge or border around something circular.

This phrase figuratively means what one says is limitless and groundless. It also means that one does something without respecting the commonly recognized principles or the thing itself is against the principles. Derogatory.

边儿，事物周围的界限。沿儿，围绕界限的部分。

没边儿没沿儿，形容说话时想说什么就说什么，没有确定的范围，而且与实际脱节。也指做事或事情的本身离开公认的准则。具有贬义色彩。