The Collaborative International Dictionary of English v.0.48:

Ingrate \In"grate`\ (?; 277), a. [L. ingratus. See
   Ingrateful.]
   Ingrateful. [Obs. or Poetic] --Bacon.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ingrate \In"grate`\, n.
   An ungrateful person. --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ingrate
    n 1: a person who shows no gratitude [syn: ingrate, thankless
         wretch, ungrateful person]

The Devil's Dictionary (1881-1906):

INGRATE, n.  One who receives a benefit from another, or is otherwise
an object of charity.

    "All men are ingrates," sneered the cynic.  "Nay,"
        The good philanthropist replied;
    "I did great service to a man one day
    Who never since has cursed me to repay,
                Nor vilified."

    "Ho!" cried the cynic, "lead me to him straight --
        With veneration I am overcome,
    And fain would have his blessing."  "Sad your fate --
    He cannot bless you, for AI grieve to state
                This man is dumb."
                                                            Ariel Selp