Tenebrous -- dark and gloomy
Found in Catherine Anderson's Sweet Nothings, a light summer romance, page 151, "Once at the stream, Molly was so charmed by the tenebrous beauty that she forgot to feel tense.
There followed a ROMANTIC??? discussion of why frogs croak, p. 151-2,
"He listened. 'You think the ones with shrill voices are lady frogs?'
"Resisting the urge to laugh, she cocked her head to listen, 'Maybe.'
"'Could be the fellas are whispering sweet nothings in their ears, and that's the lady frog's way of tittering.'"