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HYPHEN
WORDNET DICTIONARY
OXFORD DICTIONARY
ROGET THESAURUS

WORDNET DICTIONARY

Adjective unthankful has 1 sense

• unthankful(a = adj.all) thankless, ungrateful - not feeling or showing gratitude; "ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"

OXFORD DICTIONARY

ROGET THESAURUS

unthankful

Ingratitude

N ingratitude, thanklessness, oblivion of benefits, unthankfulness, benefits forgot, thankless task, thankless office, ungrateful, unmindful, unthankful, thankless, ingrate, wanting in gratitude, insensible of benefits, forgotten, unacknowledged, unthanked, unrequited, unrewarded, ill- requited, Int, thank you for nothing!, thanks for nothing!, et tu Brute!, ingratitude! thou marble-hearted fiend.

For further exploring for "unthankful" in Webster Dictionary Online