qualm
/ˈkwɑːm/Definitions
1. noun
a feeling of doubt or uncertainty about something
“She had a qualm about traveling to a foreign country alone.”
2. noun
a feeling of unease or apprehension
“He had a qualm about the safety of the old building.”
3. verb
to feel doubt or unease about something
“She began to qualm about the decision to quit her job.”