idiosyncratic
C1CEFR level
55/100Rarity: uncommon
TechnicalRegister
Medicine adjective
Relating to an unusual and unpredictable individual reaction, especially to a medicine.
Very rarely, someone has an idiosyncratic response that we simply cannot predict.
Business adjective
Specific to one particular risk or entity and largely uncorrelated with wider market movements.
Idiosyncratic risks such as a single factory fire can be diversified away across a large book.
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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