marginally

From marginal +‎ -ly.

• (General American) IPA^(key): /ˈmɑɹd͡ʒɪnəli/
• (Received Pronunciation) IPA^(key): /ˈmɑːd͡ʒɪnəli/

marginally (comparative more marginally, superlative most marginally)

1. In a marginal manner, or to a marginal extent; barely sufficiently; slightly.
   • 2011 December 10, David Ornstein, “Arsenal 1 - 0 Everton”, in BBC Sport‎:

     A similar situation saw Gervinho play in Van Persie rather than going for goal himself, only for the Dutchman to drift marginally offside.

2. In the margin of a book.

• alarmingly