Meaning: (of words) meaning the same or nearly the same
The dictionary defines "monotonous" as being synonymous with "wearisome." That is putting it mildly.
An ideal schoolmaster is not synonymous with the Headmaster of Eton or the owner of the most profitable preparatory school.
By some it is considered as synonymous with the Dark Ages, because of the decline of learning and civilization during this long interval of time.
At first, Mrs. Halifax had looked grave--most women would, especially wives and mothers, in those days when every innovation was regarded with horror, and improvement and ruin were held synonymous.
Moral dualism can only arise in minds where the ideas of good and evil are not synonymous with those of pleasure and pain, for the conception of a wholly good or a wholly evil nature requires the use of these terms in their higher, ethical sense.