Synonyms of 'faintly'
She felt faintly ridiculous.
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to a small extent
to some extent
to a certain extent
to a small degree
You use rather to indicate that something is true to a fairly great extent, especially when you are talking about something unpleasant or undesirable.
I'm afraid it's rather a long story.
Thesaurus for faintly from the Collins English Thesaurus