In a geminated manner, with doubling or repetition, or (in linguistics) with lengthened consonant pronunciation.
From geminate + -ly adverbial suffix. Technical term used in linguistic descriptions to indicate how sounds are articulated with doubling.
When linguists say a word is pronounced 'geminately,' they're describing a subtle feature you probably don't even notice unless you speak a language that requires it.
Complete word intelligence in one call. Free tier — 50 lookups/day.