My doctor took my concerns lightly, telling me not to worry too much.
lightly
/ˈlīt-lē/
adverb
in a light manner: such as
with little weight or force : gently
with indifference or carelessness : unconcernedly
idiom
to not treat seriously —usually used in negative statements
idiom
to proceed carefully
If you're thinking about asking for a raise, I advise you to tread lightly.