How many letters does the top answer for “not improved or brought up to date” have?

The most common answer is unrevised (9 letters).

Crossword clue: not improved or brought up to date

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

unrevised 9 letters wn-def

not improved or brought up to date

improved or brought up to date 80% similar → revised

not brought up to date 80% similar → unmodernised, unmodernized

brought up to date 60% similar → modernised, modernized