This is the 2500th most frequent Portuguese word.
criminais
"Criminais" means "criminals" or "related to crime" in English.
Here, 'criminais' is used as an adjective to describe 'documentos', indicating they are related to crimes.
Os documentos criminais serão revisados pelo advogado.
The criminal documents will be reviewed by the lawyer.
In this example, 'criminais' serves as an adjective modifying 'palavras', suggesting that the words pertain to or are characteristic of crime.
As palavras criminais do texto causaram preocupação nos leitores.
The criminal words in the text caused concern among the readers.
'Criminais' in this case qualifies 'investigações', meaning the investigations are related to matters of crime.