a.

1. 与情况有关的；依情况而定的
   You can't convict him merely on circumstantial evidence.

   你不能仅凭间接证据判他有罪。

2. 非主要的；偶然的
3. 详尽的，详细的
   a circumstantial account of what happened

   对所发生之事的详尽叙述

4. 排场大的；礼仪的

adj.

1. (of evidence or a legal case) pointing indirectly towards someone's guilt.
2. (of a description) containing full details.