shallow
adjective
of little depth; not deep.
Used to describe an ongoing action or continuous state that was happening at a specific time in the past.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
They kept very near to the creek and he noticed suddenly that the current was shallowing, and had grown much swifter.
From The Keepers of the Trail A Story of the Great Woods by Joseph A. (Joseph Alexander) Altsheler