obsess
verb (used with object)
to dominate or preoccupy the thoughts, feelings, or desires of (a person); beset, trouble, or haunt persistently or abnormally.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
And that this secret, once unearthed, will tell the obsessor what no one has ever been told.
From Time Magazine Archive
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