ichidan verb, intransitive verb
sensible; understanding; reasonable
Used to describe a person who is open to reason, can be talked to, or is understanding. Often used in the negative form 話せない to mean someone is unreasonable or impossible to reason with.
彼は話せる人だから、相談してみよう。
He's a reasonable person, so let's try talking to him.
あの上司は全然話せない。
That boss is completely impossible to reason with.