Antonyms of adj thankless

2 senses of thankless

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)


Sense 2
thankless, unappreciated, ungratifying -- (not likely to be rewarded; "grading papers is a thankless task")

INDIRECT (VIA unrewarding) -> rewarding -- (providing personal satisfaction; "a rewarding career as a paramedic")

Similarity of adj thankless

2 senses of thankless

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")

Sense 2
thankless, unappreciated, ungratifying -- (not likely to be rewarded; "grading papers is a thankless task")
       => unrewarding (vs. rewarding) -- (not rewarding; not providing personal satisfaction)