Sentence:  The skeletons in this sport's hitherto <WSD>unsuspicious</WSD> closet belong to upward of a dozen top-notch show jumpers, all insured for $50,000 to $250,000, all killed by a hitman-for-hire in an insurance-fraud scheme perpetrated by some of the most sterling names in the business. 
Meaning of the word marked with <WSD> tags:  Not arousing suspicion.