How many letters does the top answer for “(of events) having extremely unfortunate or dire consequences; bringing ruin” have?

The most common answer is calamitous (10 letters).

Crossword clue: (of events) having extremely unfortunate or dire consequences; bringing ruin

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

calamitous 10 letters wn-def

(of events) having extremely unfortunate or dire consequences; bringing ruin

disastrous 10 letters wn-def

(of events) having extremely unfortunate or dire consequences; bringing ruin