weaselly

/ˈwiːzəli/
adjective
  1. Resembling or characteristic of a weasel, especially in being sneaky, untrustworthy, or evasive.
    • His weaselly behavior made it hard to trust anything he said.
    • The lawyer gave a weaselly smile and avoided the question.
    • I don't like his weaselly way of shifting blame to others.
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