a worry or doubt about something
qualm - doubt
If you have a ‘qualm’ about something, then you have a feeling of uneasiness or fear about it. It does not relate to other people, instead, it is an uncertainty that makes you question whether what you’re doing or thinking of doing is correct, morally or otherwise. The word implies something instinctive, like your gut feeling or conscience. Often used in its plural form.
My qualm about dealing with that company is that they are notorious for treating their low-skilled workers little better than slaves.
I have no qualms about giving Luke the job. He is more than capable of fulfilling that role.
Can you really trust Samantha? She clearly has no qualms about lying to get what she wants.