brood
noun
a number of young produced or hatched at one time; a family of offspring or young.
Used to describe a continuous action that will progress up until a designated point of completion in the future.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
He will have been brooding about it all these years.
From The Malefactor by E. Phillips (Edward Phillips) Oppenheim