Hurt is the opposite of help.
The opposite of hinder is to help, aid, or assist.
unhelpful, helpless
Not sure that HELP has a proper opposite, Don't help, No help, hope someone else can offer you a better answer.It's harm
the opposite of unpleasant is gratefully please send for more help
The opposite could be help, also love, care, or nurture.
Aid, help
Be in the way; undermine; counteract.
No. It does the opposite.
harm hurt
The opposite of prevent is cause.Aid, allow, assist, help, let go, cause...
An antonym would be, "I was uncertain/unsure to ask help on the assignment." Both words are the opposite of certain.