conversant
adj[pred 作表语]
~ with sth (fml 文) having knowledge of sth; familiar with sth (对某事物)精通, 熟悉
thoroughly conversant with all the rules 对所有的规则了如指掌.
The reader's hair stands on end when he reads in the final pages of the novel that the heroine a dear old lady who had always been so kind to everybody, had, in her youth, poisoned every one of her five husbands.