noun
Formal or literary term for being unwell; not used in casual conversation. Often appears in written or polite contexts.
本日は不例のため、欠席させていただきます。
I will be absent today due to indisposition.
ご不例と伺いましたが、その後いかがですか。
I heard you were unwell; how are you feeling now?
The word is composed of 不 (not) and 例 (usual, precedent), literally meaning 'not the usual state'. The exact historical derivation is uncertain, but it has been used in formal Japanese to refer to illness or indisposition.