cogitate
verb (used without object)
to think hard; ponder; meditate.
Used to describe an action that began in the past, has continued continuously, and is still in progress.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
For months he has been cogitating in this uncertain way; and now determines upon knowing the truth.
From The Death Shot A Story Retold by Mayne Reid