Capable of being accused; able to be charged with or blamed for something.
From accuse (Latin accusare, from ad- 'to' + causa 'cause, case') plus the suffix -able. This adjective form developed to describe things or people that could legally be charged.
The -able suffix is like English's way of saying 'can be' or 'able to be'—so 'accusable' literally means something 'able-to-be-accused,' which is why it's so useful in legal and formal contexts!
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