goes before a negative verb and means "not properly", "hardly": something that should have been done adequately wasn't. It always takes a negative, and it sounds critical or complaining, whether about yourself or someone else.
。
I haven't been sleeping properly lately.
。
I hardly slept at all last night.
、。
When I was a kid, I barely studied.
An object often takes in place of を, which adds "not even".
。
He doesn't even say hello properly.
。
I've been so busy I haven't even been eating properly.
With or , it describes doing something else without first doing this properly.
。
He went into the match with hardly any preparation.
。
It's risky to sign without checking properly.
ろくに or あまり
〜～ just says "not much", with no judgement. ろくに says the amount or quality falls short of what it should be.
。
I haven't had anything like proper sleep.
ろくな + noun
Before a noun the form is , again with a negative: "no decent …".
。
There isn't a single decent shop in this town.
Lingaku