firm = strong

來自拉丁語的firm 意為strong。同義詞根有來自拉丁語的bil,fort/forc,rob,val/vail等。

（*拉丁文firmus(=firm) —— 英文字根字典）

1.infirmity （不強(qiáng)壯的狀態(tài)in (=not) + firm(=strong)）
n.虛弱，體弱；疾病，病癥（意志等的）薄弱
infirm adj. 虛弱的；意志不堅(jiān)定的
infirmary n.醫(yī)院；（學(xué)?；蛘邫C(jī)關(guān)的）所，醫(yī)務(wù)室
Despite Grandmother's physical infirmity,her mind is sharp as a tack. 奶奶盡管身體虛弱，頭腦卻非常敏捷。

2affirm
v.堅(jiān)稱，斷言；肯定，確認(rèn)，證實(shí) *af<ad(=to)
affirmation n.斷言；肯定，證實(shí)
affirm that the news is true 堅(jiān)稱消息屬實(shí)
It may be safely affirmed that~ 可以肯定地說...
The witness affirmed to the fact. 證人證明確是事實(shí)。

3.affirmative
adj.肯定的；同意的 *af<ad(=not)
affirmative action (=positive discrimination積極區(qū)別對(duì)待政策（對(duì)因種族、性別等原因受到歧視的群體等方面軍給予特別照顧）)
affirmative answer 肯定的回答
affirmative votes 贊成票
affirmative side 贊成方

4.confirm
v.加強(qiáng)（勢(shì)力、權(quán)力等）；證實(shí)；認(rèn)可，批準(zhǔn)；確認(rèn)；[宗]給...施堅(jiān)信禮 *con<com(=intensive)
What you tell me confirms my suspicions. 你所說的證實(shí)了我的懷疑。
The report of an earthquake in Japan has now been confirmed. 日本發(fā)生地震的報(bào)道已經(jīng)被證實(shí)。
confirm the treaty of Versailles 批準(zhǔn)凡爾賽條約
confirm a reservation 確認(rèn)預(yù)訂

5.confirmed
adj.確定的，證實(shí)的；根深蒂固的；慢性的 *con<com(=intensive)
confirmed drunkard 飲酒成癖的人
confirmed disease 痛疾；慢性病
confirmed report 可靠的報(bào)道

6.confirmation
n.確定，確認(rèn)，確證；認(rèn)可，批準(zhǔn)；堅(jiān)信禮 *con<com(=intensive)
in confirmation of 以證實(shí)...

7.firmament
n.(the~)天空；蒼天

8.disaffirm
v.抗議；反駁；注銷《dis- = not》