a) An unexpected natural or man-made catastrophe of substantial extent causing significant physical damage or destruction, loss of life or sometimes permanent change to the natural environment.
The downpour and gales turned the wedding into a disaster.
b) An unforeseen event causing great loss, upset or unpleasantness of whatever kind.<!maybe could do with being improved
A nod means good, two nods; very good. And then theres the pursing of the lips: disaster. -
Wikipedia foundation.