hesitation

brief, fractional, momentary, slight

She answered without the slightest hesitation when asked if she wanted to go to the concert.

initial

She felt initial hesitation about moving to a new city, but eventually decided it was the right choice.

after ~

After some hesitation, she finally agreed to try the new restaurant with her friends.

without ~

He agreed to help his friend without hesitation when she asked for support.

have no hesitation in doing sth

She had no hesitation in accepting the scholarship offer from the university.

a moment's hesitation, a moment of hesitation

Without a moment of hesitation, she agreed to help her friend move house.