• WordNet 3.6
    • adj ingratiatory calculated to please or gain favor "a smooth ingratiating manner"
    • adj ingratiatory pleasingly persuasive or intended to persuade "a coaxing and obsequious voice","her manner is quiet and ingratiatory and a little too agreeable"
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Century Dictionary and Cyclopedia
    • ingratiatory Insinuating; serving to render acceptable or to ingratiate one with another.
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In literature:

His white teeth flashed in an ingratiatory smile.
"Bransford of Rainbow Range" by Eugene Manlove Rhodes