"Boring" is the most used synonym for tedious although there also is "banal"; "wearisome"; "vapid"; "exhausting"; "arid" and "dull".
Both are correct.
Synonym means: a word having the same or nearly the same meaning as another in the language. Definition means: the act of defining or making definite, distinct, or clear / the formal statement of the...
live, exist, survive, breathe, endure
Procure, obtain, fetch Beget Prepare Offspring, progeny