I think quite a few people think of the word “spiritual” as referring to spirits and hence a reference to the supernatural.
Of course most words have more than one meaning.
I myself use the word in a somewhat different sense — a sense that I guess is ultimately derived from the word’s use to refer to a person’s “spirit”, as in “That’s a very spirited person”, or “She has a pleasant spirit”.
Thus, I use the word “spiritual” to refer to how someone deals with the various issues that arise from the the fact we humans perceive a distinction between an I that observes and things that are observed. It is that perception that creates the basis for a psychological self or “I”. I don’t think that use of the word has anything to do with the supernatural.
But what does that word spiritual mean to you?