Final answer:
A proper sensible is a claim based on direct sense perception, assumed to be fundamentally true, such as acknowledging that grass is green or the Earth is round. It is considered indubitable and foundational for reasoning in philosophy.
Step-by-step explanation:
A proper sensible refers to a piece of knowledge or claim that stems from direct sense perception and is considered true in a fundamental sense. Philosophers suggest that these sensibles are primary and indubitable, supporting the concept of common sense. A proper sensible is not subject to skepticism because it's based on the immediate data that our senses provide us, assumed to be self-evident.
These are immediate observations that are generally incontrovertible within the community of discourse, relying on sensory data that is directly perceived and broadly accepted as true.
The importance of proper sensibles in philosophical discourse lies in their role as foundational truths upon which rational arguments and further theorizing can be built. They are considered exempt from the demands of empirical testing or logical demonstration since they are immediately evident to the senses.