superexcellent

From super- +‎ excellent.

• (Received Pronunciation) IPA^(key): /ˌsuːpəˈɹɛksələnt/, /ˌsuːpəˈɹɛksɪlnt/

• Audio (US):

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superexcellent (comparative more superexcellent, superlative most superexcellent)

1. Uncommonly excellent; of supreme excellence.
   • 1579, Edmund Spenser, “The Shepheardes Calender”, in J. C., editor, The Works of Edmund Spenser, New edition, Philadelphia: Willis P. Hazard, 190 Chestnut Street, published 1857, page 370:

     …[Y]our Latin poems, which, in my opinion, both for invention and elocution, are verie delicate and superexcellent.

2. Better than excellent.

• “superexcellent”, in Collins English Dictionary.
• “superexcellent”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
• “superexcellent”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.