Antonyms of adj unthankful

1 sense of unthankful

Sense 1
ungrateful (vs. grateful), thankless, unthankful -- (not feeling or showing gratitude; "ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare)


Similarity of adj unthankful

1 sense of unthankful

Sense 1
ungrateful (vs. grateful), thankless, unthankful -- (not feeling or showing gratitude; "ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare)
       => unappreciative -- (not feeling or expressing gratitude; "unappreciative of nature's bounty")