adventitious
C2CEFR level
88/100Rarity: very rare
FormalRegister
Arising by chance rather than by design or inherent nature.
The masterpiece owed its haunting colour to a wholly adventitious flaw in the pigment.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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