adjective
BAD : The flight from Hong Kong to London was very tiresome.
GOOD : The flight from Hong Kong to London was very tiring.
BAD : After two tiresome days, we both needed some sleep.
GOOD : After two tiring days, we both needed some sleep.
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tiresome = annoying or irritating: 'I find these so-called jokes extremely tiresome.
' tiring = causing tiredness; exhausting: 'Looking at a computer screen all day can be very tiring.'