The phrase “I have been on my finest conduct” is usually used to point that somebody has been appearing in a very well-behaved or well mannered method, typically as a way to make a very good impression or keep away from stepping into bother.
There are lots of explanation why somebody may select to be on their finest conduct. For instance, they might be in a state of affairs the place they should make a very good impression, akin to a job interview or a primary date. They might even be making an attempt to keep away from stepping into bother, akin to when they’re round somebody who is thought to be strict or authoritarian.