How many letters does the top answer for “being or producing something like nothing done or experienced or created before” have?

The most common answer is groundbreaking (14 letters).

Crossword clue: being or producing something like nothing done or experienced or created before

groundbreaking, innovational, innovative.

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

groundbreaking 14 letters wn-def

the ceremonial breaking of the ground to formally begin a construction project

innovational 12 letters wn-def

being or producing something like nothing done or experienced or created before

innovative 10 letters wn-def

being or producing something like nothing done or experienced or created before