noc=nec=nic=nox=＝to harm（伤害）c-s-z-x

innocent['inəsənt] 联想记忆 in里面 no没有cent一分钱 兜里没有一分钱 无辜的
(of a person) not guilty of a particular crime, or having no knowledge of the unpleasant and evil things in life, or (of a thing) harmlessly intended:
An innocent person is someone who is not involved with any military group or war
a person who has very little experience and does not know about the bad things that happen in life
adj. 无辜的；无罪的；无知的
n. 天真的人；笨蛋

耶鲁公开课 - 1945年后的美国小说课程节选
Their great brown, innocent eyes looked into ours with such soulful intensity that not one of us had the slightest sexual thought about them.
她们瞪着天真的棕色大眼睛盯着我们,我们也望着她们，心里没有一丝邪念。

nocuous['nɔkjuəs]
likely to cause damage or injury; harmful; noxious
adj. 有害的，致伤的;有毒的

例句
The instrument emits nocuous radiative materials.
这仪器散发有害的辐射物。

noxious ['nɔkʃəs]
describes something, especially a gas or other substance, that is poisonous or very harmful:
harmful and unpleasant
adj. 有害的；有毒的；败坏道德的；讨厌的

例句
Noxious chemicals are found in the river water.
河水里发现了有毒化学物品。

obnoxious[ɔb'nɔkʃəs] ob "to, toward"
extremely unpleasant, especially in a way that offends people
adj. 讨厌的；可憎的；极不愉快的

例句
These fires produce really obnoxious fumes and smoke.
这些火炉冒出来的烟气确实很难闻。

internecine [,intə'ni:sain]
mutually destructive.
characterized by great slaughter
Of or relating to struggle within a nation, an organization, or a group
adj. 两败俱伤的；互相残杀的；致命的

例句
internecine strife among the nationalities of the empire
帝国中各民族间的纷争

necrosis [neˈkrəusis]
Death of cells or tissues through injury or disease, especially in a localized area of the body.
n. (细胞组织)坏死 ;【植物病理学】枯斑，黑斑病

pernicious[pə'niʃəs] per pierce
1. causing insidious harm or ruin; ruinous; injurious; hurtful: pernicious teachings; a pernicious lie.
2. deadly; fatal: a pernicious disease.
3. Obs. evil; wicked
adj. 有害的；恶性的；致命的；险恶的

例句

The pernicious effect of this advertising on children is a problem that we ignore at our peril.
这则广告将对孩子有潜移默化的坏影响，我们置之不理，风险将由我们自己来承担。
Business may be troublesome,but idleness is pernicious.
事业虽扰人,怠惰害更大。
The principle had been pernicious from beginning to end.
这条原则自始至终都是有害的。