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Adjective: fulgurant  fûl-gyu-runt
Usage: rare
  1. Amazingly impressive; suggestive of the flashing of lightning
    "these great best canvases still look as astonishing and as invitingly new as they did...when...his fulgurant popularity was in full growth";
    - dazzling, eye-popping [informal], fulgurous [rare]

See also: impressive