なしに（は）・なしでは 英語で:

I'm sad without you.

She did without necessities to pay for her daughter's lessons.

For the crime of first degree murder, this court hereby sentences you to life in prison without the possibility of parole.

I can go months without an alcoholic drink, but not even one hour without a cigarette.

If you work too long without a rest, it begins to tell on you.

You're playing with fire if you insist on riding your motorcycle without a helmet on.

The front wheel plays an important role in two-wheeled vehicles moving without falling over.

You will never get far without the co-operation, confidence and comradeship of other men and women.

The rain stopped just long enough for me to dash into the cafe without getting wet.

It is needless to say that an experienced person will do better than someone without experience.

It is difficult to overcome this shortcoming without drastically changing the whole system.

If you spend too much time in the sun without putting on sunscreen, you are likely to get a sunburn.

I think it's highly unlikely that Tom was not aware that he wouldn't be allowed to enter the museum without his parents.

Charles Moore created Forth in an attempt to increase programmer productivity without sacrificing machine efficiency.

An infinitive without a 'to' attached is called a bare infinitive.