English

Adverb

challengingly ‎(comparative more challengingly, superlative most challengingly)

1. In a way or to an extent that challenges
   • 2009, January 19, “Janet Maslin”, in Smiley Faces in Our Chromosomes:

     […] Mr. Keltner is ready and eager to conduct all manner of experiments, whether they are whoopee-cushion silly or challengingly serious.