unrewarding 

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a.   rewarding

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1. Defining it is as unrewarding as dissecting a soapbubble.
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2. Such parts are often considered to be thankless, unrewarding.
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3. Lectures often seem very formal and empty things; recitations generally prove very dull and unrewarding.
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adj.
  1. not rewarding; not providing personal satisfaction

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unrewarding
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Unrewarding love
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