Wiktionary
a. Not challenging; easy to do.
Usage examples of "unchallenging".
Housework was humdrum, hard but unchallenging, and the house no longer held any stimulation for her.
In his later years, Selwyn, who had ignored his gifts for the dour business of serpent slaying, a necessity during his day, when Argonia's coast was plagued with the snakes, decided that slaying the sea serpents was a boring and unchallenging occupation.
From the outset, though, the flight proved to be anything but unchallenging: The Beechcraft was a lemon.
The American psychiatrist Ernest Hartmann of Tufts University has provided anecdotal but reasonably persuasive evidence that people who are engaged in intellectual activities during the day, especially unfamiliar intellectual activities, require more sleep at night, while, by and large, those engaged in mainly repetitive and intellectually unchallenging tasks are able to do with much less sleep.