What is "nightmarishly"

Usage examples of "nightmarishly".

He's heard the stories from the claim-jumpers and boardroom bandits, from the greenmail experts with their roots in the earthbound jurisdictions that have made such a hash of arbitration here: how she can experience a year in a minute, rip your memories out through your cortical implants and make you relive your worst mistakes in her nightmarishly powerful simulation system.

There is only now, a moment of alien plants and fiery itch and cool mud, and here, mudroom and garden mushed together, nightmarishly changed.

In my childhood the shunned house was vacant, with barren, gnarled and terrible old trees, long, queerly pale grass and nightmarishly misshapen weeds in the high terraced yard where birds never lingered.