i Register
In some senses, disimprove is marked as informal, rare. Watch for register when choosing this word.
disimprove
verb 3
Definitions
verb
1
To make worse.
To which may be added this advantage, that the services of churchmen are rewardable upon the church's stock: no need to disimprove the royal banks to pay thanks to bishops.
2
To deteriorate.
3
To try to make something better but end up making it worse.
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