certifiably

adverb4

1. •
   Genuinely

   • The main purpose for California Certified Organic Farmers is to certify that the products that growers are selling are certifiably organic — 1990
2. •
   To a great extent.

   • He is certifiably nuts
3. •
   Undoubtedly, demonstrably.

   • The Tofu Cheesecake Bake-Off, which ten daring bakers had entered, was a special event held mid-week. It was, certifiably, the world's first such tofu pie contest — 1981
4. •
   With the potential for certification.

   • Must such a neighborhood or district maintain a certain percentage of certifiably ethnic residents to maintain its eligibility? — 1997