vaikea, hankala, vaativa
haastava
kiehtova
haastava, vaikea, hankala
(infl of)
Difficult, hard to do.
(rfdef)
(quote-journal)
The act of making a challenge.
{{quote-text|en|year=1918|author=Estcourt Rowland Metzner|title=The conflict of tax laws|page=151