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chal‧leng‧ing

Teaching young children is a challenging and rewarding job.
a challenging problem —challengingly adverb
WORD FOCUS: difficult 
difficult to do: hard, tough, challenging, daunting
difficult and needing a lot of physical effort: tough, strenuous, back-breaking, gruelling, arduous, punishing
difficult to deal with or talk about: tricky, awkward, delicate, sensitive, touchy
words for describing a difficult person: awkward, trying
words for describing difficult conditions: adverse, hostile
➔ See also difficult
