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A JavaScript object can be considered false in the following ways but remain not null:

1. If its boolean representation is false: An object's boolean value is typically true, but it can be false if it is a falsy object like an empty array or an object with no properties.

2. If its length is 0: An object with a length property can be considered false if its length is 0. This is often the case with empty arrays.

3. If it has a valueOf() or toString() method that returns a falsy value: An object with these methods can be considered false if the methods return a falsy value like 0, false, or '' (empty string).

4. If it is explicitly compared to false: An object can also be considered false if it is explicitly compared to false using the === operator. However, this is not a common scenario.

In all of these cases, the object is still not null, but it can be evaluated as false in a boolean context.