What is the synonym for lurked?

Here are some synonyms for "lurked", depending on the context:

General:

* Hidden

* Concealed

* Stalked

* Slithered

* Skulked

* Hovered

* Waited

* Snooped

* Observed

More specific:

* Loitered (implies waiting around aimlessly)

* Ambushed (implies waiting to attack)

* 潜伏 (qiánfú) (Chinese, means "to lie in wait")

The best synonym depends on the specific situation and the nuance you want to convey.