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Adjective: ingratiatory  in'grey-shee-u,to-ree [N. Amer], in'grey-shee-u-t(u-)ree [Brit]
  1. Pleasingly persuasive or intended to persuade
    "her manner is quiet and ingratiatory and a little too agreeable";
    - coaxing
  2. Calculated to please or gain favour
    "a smooth ingratiatory manner";
    - ingratiating, insinuating

See also: flattering, persuasive, suasive [rare]