This is the 4265th most frequent Portuguese word.
acidental
Accidental; occurring unexpectedly or unintentionally.
Here, 'acidental' is used as an adjective to describe the nature of the accident as unintentional or unforeseen.
O derramamento de tinta foi um acidente acidental.
The spill of ink was an accidental accident.
In this context, 'acidental' means something occurring by chance, unintended.
A descoberta foi completamente acidental.
The discovery was entirely accidental.
The word 'acidental' here refers to the unexpected aspect of the action leading to the result.