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rationale
Definition: (noun) an underlying reason or explanation.
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weaken

verb
  1. To lose strength or power: decline, degenerate, deteriorate, fade, fail, flag2, languish, sink, wane, waste (away). Informal: fizzle (out). Idioms: go downhill, hit the skids. See increase, strong
  2. To lessen or deplete the nerve, energy, or strength of: attenuate, debilitate, devitalize, enervate, enfeeble, sap2, undermine, undo, unnerve. See strong
  3. To lessen the strength of by or as if by admixture: attenuate, cut, dilute, thin, water (down). See strong
  4. To moderate or change a position or course of action as a result of pressure: ease off, relent, slacken, soften, yield. Idiom: give way (or ground). See strong