This is the 5075th most frequent Turkish word.
halini
"Halini" means "your (or his/her/its) condition/state" in English, depending on context.
In this sentence, 'halini' refers to 'the state' or 'condition' of being a good friend, demonstrating personal qualities.
Onun ne kadar iyi bir arkadaş olduğunun halini görebilirsin.
You can see the state of how good a friend he is.
Here, 'halini' is used to refer to the condition or state of the painting, indicating its need for restoration.
Bu tablonun halini düzelterek daha güzel yapabiliriz.
We can improve the state of this painting by fixing it.
In this instance, 'halini' represents 'the state' of people as affected by the stress of a busy working environment.