expedient

Adjective
  1. Serving to promote your interest (synset 300934824)
    "was merciful only when mercy was expedient"
  2. Appropriate to a purpose;
    Practical (synset 301819018)
    "in the circumstances it was expedient to express loyalty"
Noun
  1. A means to an end;
    Not necessarily a principled or ethical one (synset 100178297)

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