How many letters does the top answer for “(used especially of ideas or principles) deeply rooted; firmly fixed or held” have?

The most common answer is implanted (9 letters).

Crossword clue: (used especially of ideas or principles) deeply rooted; firmly fixed or held

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

implanted 9 letters wn-def

(used especially of ideas or principles) deeply rooted; firmly fixed or held

ingrained 9 letters wn-def

(used especially of ideas or principles) deeply rooted; firmly fixed or held

planted 7 letters wn-def

(used especially of ideas or principles) deeply rooted; firmly fixed or held