invaluably

From invaluable +‎ -ly.

invaluably (comparative more invaluably, superlative most invaluably)

1. In an invaluable manner; inestimably.

• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “invaluably”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.
• “invaluably”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.