1.inadequate a．不充分的（insufficient）

词根记忆：．n（不）+adequate(充足的)--不充分的

例：Only states with seriously inadequate road systems need to spend large amounts of money on road improvements.

派生词：inadequately( ad.不适当地；不够好地)

2.inalienable a.(指权利等)不可让与的，不可剥夺的( that cannot be transferred to another or others)

例：the inalienable rights of the individual个人不可剥夺的权利

同根词：alienate(v.疏远：转让)

3.incandescent a．白炽的(strikingly bright, radiant, or clear)；遇热发光的(white, glowing, or luminous with intense heat)

词根记忆：in（使…）+cand（白；发光）+escent(开始出现…的)--遇热发光的

例：It may be sad to think that we no longer have domestic sources of steel flatware, rebar, and incandescent bulbs.

4.incentive n．刺激(stimulant)；动机(motive)

例：The system of patent-granting was originally established as an incentive to the pursuit of risky new ideas.

5.incinerate v.焚化：(to burn to ashes; cremate)；毁弃

词根记忆：in（使）+ciner(灰)+ate--使成灰--焚化

例：Last year all refuse collected by Shelbyville city services was incinerated.

派生词：incineration(n．焚化，烧成灰)

6.incineration n.焚烧（setting on fire）

词根记忆：来自incinerate(v.焚化，火葬)

例：incineration of solid wastes焚烧固体垃圾

派生词：incinerator(n．焚化炉)

7.incipient a．初期的．刚出现的(beginning to exist or appear)

例：Its ability to climb trees was likely hindered by the presence of incipient feathers on its forelimbs,

派生词：incipiently( ad.起初地：早期地)

8.incline n.斜坡(an inclined plane)；v.使倾斜(to lean, tend, or become drawn toward an opinion or course of conduct)

词根记忆：in+cline(倾斜)--斜坡

例：In pursuing a moving insect, the beetles usually respond immediately to changes in the insect's direction, and pause equally frequently whether the chase is up or down an incline.

派生词：inclination(n.倾向；爱好)

同根词：inclinometer(n.倾角罗盘)

9.inclusion n，包含(the state of being included)；内含物(sth. that is included)

词根记忆：来自include(v.包含，包括)

例：They believed that the Whigs' inclusion of women in party politics had led to the Whigs' success in many elections.

同根词：exclusion(n.排除；排斥)