From The Collaborative International Dictionary of English v.0.48:
Unformed \Un*formed"\, a. [In sense 1 properly p. p. of un form;
in senses 2 and 3 pref. un- not + formed.]
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1. Decomposed, or resolved into parts; having the form
destroyed.
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2. Not formed; not arranged into regular shape, order, or
relations; shapeless; amorphous.
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3. (Biol.) Unorganized; without definite shape or structure;
as, an unformed, or unorganized, ferment.
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Unformed stars (Astron.), stars not grouped into any
constellation; informed stars. See Sporades.
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