How many letters does the top answer for “causing or capable of causing harm” have?

The most common answer is harmful (7 letters).

Crossword clue: causing or capable of causing harm

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

harmful 7 letters wn-def

causing or capable of causing harm

not causing or capable of causing harm 75% similar → harmless

capable of causing burns 50% similar → scorching

causing harm or injury 50% similar → detrimental, prejudicial