Adverb
calamitously (comparative more calamitously, superlative most calamitously)
In a calamitous manner.
And all those plans must play out, calamitously, flawlessly or otherwise. Source: Internet
Just north of the falls, a new elevator takes visitors from the precipice of the gorge to the rocky riverbank for a close-up look at one of those industrial ruins, a power plant that collapsed calamitously in 1956. Source: Internet
It’s an odd story, in a number of ways, and this may be because, as Shaffer says, the film was “calamitously directed by Anthony Page". Source: Internet