transcription, транскрипция: [ ˈthaŋk-ləs ]
adjective
Date: 15th century
1. : not likely to obtain thanks : unappreciated
a thankless task
2. : not expressing or feeling gratitude : ungrateful
how sharper than a serpent's tooth it is to have a thankless child — Shakespeare
• thank·less·ly adverb
• thank·less·ness noun