I am feeling rather off today.我今天很不舒服.rather off是做什么的啊?

rather是非常
off是不舒服
off
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ad.
1. (离)开,(走)开,(隔)开
They went off together and left me sitting there.
他们一同离开了,留下我独自坐在那里。
2. (时间、空间上)离,距
The town is five miles off.
小城离这儿五英里远。
3. 切断,关掉,停止;取消;不在工作,休息
He turned off the light before going out.
他出门前把灯关掉。
4. 完,光,直到最后
I've paid off my debts.
我已把债款还清了。
5. (食品)变坏,变质;不再供应
The milk has gone off.
这牛奶已变质。
6. 不如通常水平
7. (消)除,(去)除
prep.
1. 离开...,隔着...;在(离岸边不远的)海面
He lifted a cup off the table.
他从桌上拿起一只杯子。
2. 从...脱落,从...掉下
3. 偏离...;失去...
You're going off the subject.
你们离题了。
4. 通向...;从...分岔
The dining room is off the living room.
餐室通向起居室。
5. 戒掉...;停服...
He is off smoking.
他戒烟了。
6. 以...为依靠,以...为食
7. 低于...;折价
He offered to take 10% off the price.
他表示愿意按原价减去百分之十。
a.[Z]
1. 离去的;偏离的
I must be off now.
我这就得走了。
2. 休假的,不上班的
Tomorrow will be my day off.
明天我休息(不上班)。
3. 不合时令的[B]
4. 情况不好的;(食物)腐败的
This cheese is off.
这乳酪已变质。
5. (电器等)关着的;(电流等)切断的[F]
The electricity is off.
电流切断了。
6. 较远的,另一侧的
vt.
1. 宰了

off用在系动词feel后作表语，
rather副词，修饰off

还可以说off colour=(unwell/ill)感到不舒服
rather=quite=very
=I am feeling very unwell today.