Bertrand Russell called the ineffable quality of something as the knowledge by acquaintance; it sneaks up on anything and every "thing" if one pays (close) attention to that "thing" - like the palm of your hand. No matter what you say or type in describing it, it does not add to the experience itself. It just burdens or even obfuscates the “thing” with more "facts" - rendering it superfluous to the experience of that “thing”. Explanation of a hand may be great/required from a third-person (objective) sense, but nothing can capture the first-person (experience) than the raw experience itself - it is complete in and of itself. It is also an unattainable grape-bunch to any language to capture the essence of experience (mere noises or squiggles we may try in getting at it) — like this paragraph I just composed.