Answer:
Fish-and-water.
Step-by-step explanation:
There is a possibility that individuals are so accustomed to certain aspects of their personality that they might not be aware of those traits. This is called the fish-and-water effect.
The fish-and-water effect is simply a phenomenon used by philosophers to illustrate the fact that fishes has the water such as rivers, sea, ocean etc as its natural habitat and as such are always in water but do not realize the simple fact that they are also always wet. Thus, a fish-and-water effect illustrates the failure of self judgment among people.
For instance, my neighbor is always messy and unkempt, but do not realize that.