翻译 无心的话可能会伤害人(用上likely)

It's likely to hurt others by unintentional words.
Unintentional words are likely to hurt others.

It is likely that your unconscious words hurt others.
(unconscious 无意识的; 失去知觉的 晕过去的; 不省人事的 不知道的; 没察觉到的(of) 无意的, 不知不觉的)

It's likely to hurt others by unintentional words.
unintentional无意识的,偶然的
unconscious 无知觉的,无意识的,不受意识控制的

一楼正确，unintentional才是无心的意思，二楼的是没有知觉的，着重强调的是失去了意识这方面的意思。