1. A written message or annotation that is impossible or extremely difficult to read or understand due to poor handwriting, unclear symbols, or illegible text
The doctor's indecipherable note on the prescription confused the pharmacist.
A nota indecifrável do médico na receita confundiu o farmacêutico.
2. A musical note that cannot be clearly identified or interpreted due to ambiguous notation or context
The composer left an indecipherable note in the margin of the score.
O compositor deixou uma nota indecifrável na margem da partitura.