How many letters does the top answer for “involving or creating circumstances detrimental to success or effectiveness” have?

The most common answer is disadvantageous (15 letters).

Crossword clue: involving or creating circumstances detrimental to success or effectiveness

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

disadvantageous 15 letters wn-def

involving or creating circumstances detrimental to success or effectiveness

unfavourable 12 letters wn-def

involving or creating circumstances detrimental to success or effectiveness