enfeeble
verb (used with object)
to make feeble; weaken.
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.
Ill health was enfeebling him, destroying his wonted activity.
From The Story of Commodore John Barry by Martin I. J. (Martin Ignatius Joseph) Griffin