Causing boredom, annoyance, or fatigue; dull or tedious and unpleasant to deal with.
From 'tire' (to fatigue or bore), from Old English 'teorian.' Added '-some' suffix to make an adjective meaning 'full of tiredness.'
Adding '-some' to words creates adjectives meaning 'full of that quality'—tiresome, awesome, lonesome, gruesome—it's one of English's most productive ways to make new adjectives.
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