Modifies a noun

• mistake: Since his calamitous mistake in the World Cup Final, Oliver Kahn's life has spun out of control.

• consequence: Tony Blair's New Labor has taken us to war five times in the last six years, each time with calamitous consequences.

• effect: Failure to find a way to trade fairly will have a calamitous effect on small countries like ours.

• result: Such a destruction has only ever occurred, to date, under Communism - with calamitous results.

• failure: Any attack against Iraq that allows Saddam Hussein to be spirited into the mountains will be deemed a calamitous failure.

Modifying Another Word

• potentially: But the terminator technology could also spread to neighboring food crops, with potentially calamitous effects on food production.

• often: Premonition A premonition occurs when future events, often calamitous in nature, are foreknown via individual psychic experience.

Used with adjective complement

• prove: On 13th September, 1645, at Philiphaugh outside Selkirk, this was to prove calamitous.