Wearisome means tiring and dull to keep up with. A wearisome journey.
It is the dullness that does the tiring, which separates it from merely hard. Wearisome is slightly literary and is usually said of a task or a person's habit.
1adjectivewearisomeTiring and dull to keep up with.
“The correspondence became wearisome by the fourth letter.”
wearisome is a quality.
Weary plus -some; the ending means tending to cause, as in troublesome.
Middle English
werisom
English, today
wearisome
From Middle English werisom, equivalent to weary + some.
Etymology from Wiktionary, CC BY-SA