形容詞 harmless:

1. not causing or capable of causing harm
2. not injurious to physical or mental health
   同義詞：innocuous
3. not producing any toxic effects
4. unlikely to harm or disturb anyone
   同義詞：innocuous
5. not threatening to life or health; not malignant
   同義詞：nonmalignant

1. I made a harmless remark to some guy at the bar and he swung at me.
   在酒吧里我向某個家伙說了句無惡意的話，他就向我打了一拳。
2. Causing no harm; harmless.
   無惡果的; 無害的
3. This snake is harmless.
   這條蛇是無毒的。
4. The bomb blast killed several harmless passers-by.
   炸彈爆炸使幾個無辜行人受傷。

harm.less

adj.（形容詞）
Incapable of causing harm.
不會造成傷害的
Free from loss or legal liability:
沒有受到損失或免于法律責任的：
例句：
Under the agreement, I would be held harmless if the other parties defaulted.
通過協(xié)定如果其他當事人不出庭的話我將免于承擔法律責任

【引伸】
harm.lessly
adv.（副詞）
harm.lessness
n.（名詞）