thankfulness
Word family
- thankverbA2
- thanksnounA1
- thanksinterjectionA1
- thankfuladjectiveB1
- thankfullyadverbB2
- thanklessadjectiveC1
- thanklesslyadverbC1
Synonym discussion
Sense: adjective/1
Thankful and grateful are the closest pair, often interchangeable in everyday English. The main difference is that thankful can carry relief ("I'm thankful you're safe"), while grateful more consistently implies appreciation for a kindness received. Appreciative is more formal and intellectual — it suggests you recognise the value of someone's help rather than feel emotional warmth toward them. Relieved overlaps with thankful sense 3 but lacks gratitude entirely; you can be relieved without being thankful to anyone. Indebted is much stronger and implies a sense of moral obligation: "I am deeply indebted to my mentor" suggests you owe them a serious debt, not just a thank-you. In casual speech, grateful and thankful are safest; use appreciative in workplace emails, and indebted only when you genuinely mean you owe someone a significant favour.
Common collocations
Etymology
Thankfulness is formed by adding -ness (which turns adjectives into nouns) to thankful. Thankful itself comes from the noun thank (from Old English þanc, meaning 'thought, gratitude') plus the suffix -ful ('full of'). So the word's literal path is: 'full of thanks' → the quality of being full of thanks. The Old English þanc is related to the verb thencan ('to think') — in early Germanic languages, gratitude was seen as a kind of thoughtful remembering of a kindness.
First known use
12th century
12th century, in the meaning defined at sense 1