unofficial russian

• това́рищеский

  comradly, friendly, unofficial

• неофициа́льный

  unofficial, informal, off the record

• неофициально

  unofficial, unofficially

• неуставно́й

  non-statutory, non-regulation, unauthorized, unlawful, irregular, unofficial

• шаба́шничать

  to do odd jobs, to moonlight, to do unofficial work for extra money

• обтяпывающий

  arranging (informally/quickly), managing (unofficially), getting things done (expediently)