Words from
proliferate
    increase rapidly in numbers; multiply.
    
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    parsimony
    extreme unwillingness to spend money or use resources.
    
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    rueful
    expressing sorrow or regret, esp. when in a slightly humorous way.
    
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    protracted
    lasting for a long time or longer than expected or usual.
    
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    abate
    cause to become smaller or less intense.
    
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    acute
    (of a bad, difficult, or unwelcome situation or phenomenon) present or experienced to a severe or intense degree.
    
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    balk
    hesitate or be unwilling to accept an idea or undertaking.
    
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    imperative
    an essential or urgent thing.
    
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