"smoothened" in the verb sense
1. smooth, smoothen
make smooth or smoother, as if by rubbing
"smooth the surface of the wood"
2. polish, smooth, smoothen, shine
make (a surface) shine
"shine the silver, please"
"polish my shoes"
3. smoothen
become smooth
"smoothened" in the adjective sense
1. smoothed, smoothened
made smooth by ironing
Source: WordNet® (An amazing lexical database of English)
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