21 in as moch as they knewe, that there is a God, and haue not praysed him as God ner thanked him, but became vayne in their ymaginacions, and their foolish hert was blynded.
Bible verses about "unthankfulness" | Coverdale
Romans 1:21
1 Thessalonians 5:18
18 in all thinges be thankfull: for this is the wyll of God in Christ Iesu towarde you.