Both This and That (も〜も)

寿司も刺身も replaces the plain object marker を entirely, listing two items on completely equal footing, distinct from と, which lists items as a fixed group, “sushi and sashimi” as one set, while も〜も treats each one separately, “sushi, and sashimi too.”

い-adjectives drop い for くも, 美味しい becomes 美味しくも; な-adjectives and nouns take でも, 賑やかでも. Paired with ない at the end and 特に (particularly) up front, this becomes a natural way to describe something as thoroughly unremarkable, neither one extreme nor the other.

Xでも Yでもない rules out two possibilities at once, “it’s neither X nor Y,” often followed by a confident conclusion about what it must be instead, pairing naturally with はず, which you already know.