Intermediate (B1)
IPA: /ˈθæŋkləsli/
KK: /θæŋklesli/
Definition
In a way that shows no gratitude or appreciation.
Example
She worked thanklessly for years, never receiving any recognition for her efforts.
Conversation

I feel like I do so much for them, and it's all done thanklessly.

Yeah, that can be really frustrating sometimes.

It's like they don't even notice the effort I put in.

I get that; it’s hard when you feel unappreciated.
Synonyms & Antonyms
Synonyms
ungratefully
thanklessly
unappreciatively
Antonyms
gratefully
appreciatively
thankfully
Root Explanation
Thanklessly → It is formed from "thank" (from Old English *þanc*, meaning gratitude or thanks) and "-less" (meaning without). The word "thanklessly" means without gratitude or thanks.
Memory Tip
Think of being without gratitude — 'thank' means gratitude, and '-less' means without.
Visually Confused Words
tankless
tracklessly
taintlessly
stainlessly
thackless
taxlessly
manlessly
haplessly