unsolvedadjective
uk/ˌʌnˈsɒlvd/us/ˌʌnˈsɑːlvd/C1 that has not been solved:
an unsolved mystery
Thesaurus: synonyms and related words
Complicated and difficult to do
- advanced
- ambitious
- another
- arduous
- as much as you can do idiom
- fiddly
- fiendish
- fierce
- formidable
- get blood out of/from a stone idiom
- murky
- painstaking
- picnic
- problematic
- punishing
- rigorous
- uphill
- vexed
- wearing
- wearying
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