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Familiarity breeds contempt.
He had very little familiarity with physics.
The familiarity to his friend was striking.
The adverb form of familiarity is familiarly, but you could say "with familiarity" or "in a familiar tone".
Yes. That is the correct spelling of familiarity.
Though it does not necessarily show that there is value in familiarity. the most well-known proverb is "Familiarity breeds contempt."
How about the old adage 'Familiarity breeds contempt'.