obsession

• Persistent, unwanted idea or impulse which is considered normal when it does not markedly interfere with mental processes or emotional adjustment.

• " It is an obsession. - "There was a King in Egypt", Norma Lorimer.
• The face he never saw became an obsession with Mr. Neal. - "The Best Short Stories of 1921 and the Yearbook of the American Short Story", Various.
• He had one obsession now- to destroy Adrian Fellowes, his agent for Paul Kruger in the secret places of British policy and in the house of the Partners, as it were. - "The Judgment House", Gilbert Parker.

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