Not all aspects are equal.
A basic and ages-old tenet of astrological doctrine assigns more power to a conjunction or opposition than to a sextile, as an example.
Which is why there are "major" aspects and "minor" aspects.
A planet not in aspect to other planets in a chart is disjunct...not joined or uniited.
From the psychological perspective the energies symbolized by the planet are not well-integrated into the personality. The energies will manifest in a way that is disconnected from the "main body" of the personality. There may be occasional "atypical" behaviors, out-of-character actions, unexpected eccentricities. There may be a sense of detachment where the planetary energy is concerned, feelings of separateness, isolation, difference from the norm. Situations may come up which can be characterized by a strong sense of either -- or, where one must choose between clearly antagonistic or mutually exclusive alternatives. The condition may indicate a break in some association. A lack of coherence or logical sequence may appear from time to time; episodic disruptions in the normal course of things.
You can think about this idea of being separate, disjunct and develop your own understanding of what it might mean in any particular horoscope, such as your own. Or study a text on psychology describing the effects of disjunction.
Once we have a grasp of the many possibilities of an unaspected planet in general, we can turn our attention to Uranus.
What does Uranus mean, symbolize? The symbolism contains many possibilities. Usually the energies (meanings) of a planet manifest in several ways more or less simultaneously, or consecutively. I think Robert Hand calls this polymorphism, a very apt term.
It is, of course, necessary to consider the sign and house holding the unaspected planet. The lord of the sign the planet is in disposes it toward one thing and another, so we have to look carefully at the conditioning of that lord. There is an intimate connection between the unaspected planet and its lord.
With Uranus in the Second House, things such as our resources, our degree of personal liberty, supportive associations and the things we value (our sense of values) are apt to be featured...and colored by the nature of Uranus, as modified and determined by his lord. Venus has a natural association with these affairs, so its biquintile to Uranus serves to underscore the same things. We need to understand the biquintile aspect of course, what it shows.
How do you interpet an unaspected uranus? That's how I would do it.
Or, if I weren't much interested in studying and learning astrology but only wanted to know what my own Uranus means in my life, I would engage an astrologer to tell me.