fear的同根形容词有：
fearful 可怕的担心的严重的
fearless 无畏的大胆的
类似的还有：
harm-harm(名词)-harmful-harmfully
fear-fear(名词)-fearful-fearfully
fool-fool(名词)-foolish-foolishly
use-use(名词)-useful-usefully
care-care(名词)-careful-carefully
例句：
I could feel a knot offearin my throat.
我很害怕，感到喉咙发紧。
The doctor's report confirmed our worstfears.
医生的报告证实了我们最大的担忧。
Ifearthat I can't come on time.
我恐怕不能准时到达了。
Ⅰ. afraid “害怕”是形容词，只能作表语，而不能作定语，后接of 短语或不定式，构成be afraid of sb. 和be afraid to do sth
① She is afraid of a snake. 她害怕蛇。
② The little girl is afraid to go out at night.
afraid +that clause “恐怕”，是婉转拒绝别人的一种表达方式。如：
① I’m afraid (that) I can’t go to the party. My brother is sick. 恐怕我不能去参加聚会了。我弟弟病了。
Ⅱ. fear “害怕”是动词，与be afraid 往往通用，但不如它常用(特别是在口语中)。如：
① We fear no difficulty.我们不怕困难。
② He feared to speak his mind.他不敢说出自己的想法。
③ Fearing that he would catch cold， I went out to see him.因为怕他会受凉，我走去看他。
Ⅲ. frightened adj “受惊吓的、害怕的”可做表语，也可作定语。如：
① She is too frightened to move.她太害怕了不能动弹。
② A frightened girl is crying. 一个受惊的女孩正在哭。
fear形容词形式
形容词形式是fearful，中文意思是adj.
担心担忧忧虑可怕的吓人的恐惧的极坏的极糟的
例句
They are fearful that unemployment will soon break the barrier of three million
他们担心失业人数很快将突破300万大关。
