1.inadequate a．不充分的（insufficient）

詞根記憶：．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.

派生詞：inadequately( ad.不適當地；不夠好地)

2.inalienable a.(指權利等)不可讓與的，不可剝奪的( that cannot be transferred to another or others)

例：the inalienable rights of the individual個人不可剝奪的權利

同根詞：alienate(v.疏遠：轉讓)

3.incandescent a．白熾的(strikingly bright, radiant, or clear)；遇熱發光的(white, glowing, or luminous with intense heat)

詞根記憶：in（使…）+cand（白；發光）+escent(開始出現…的)--遇熱發光的

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)；動機(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)；毀棄

詞根記憶：in（使）+ciner(灰)+ate--使成灰--焚化

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

派生詞：incineration(n．焚化，燒成灰)

6.incineration n.焚燒（setting on fire）

詞根記憶：來自incinerate(v.焚化，火葬)

例：incineration of solid wastes焚燒固體垃圾

派生詞：incinerator(n．焚化爐)

7.incipient a．初期的．剛出現的(beginning to exist or appear)

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

派生詞：incipiently( ad.起初地：早期地)

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

詞根記憶：in+cline(傾斜)--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.

派生詞：inclination(n.傾向；愛好)

同根詞：inclinometer(n.傾角羅盤)

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

詞根記憶：來自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.

同根詞：exclusion(n.排除；排斥)