Verb meaning "to satisfy a definition in an unsatisfying way"

Solution 1:

B has refuted/invalidated/disproved/debunked A's definition.

• refute: Prove (a statement or theory) to be wrong or false; disprove

• invalidate: Make or prove (an argument, statement, or theory) unsound or erroneous

• disprove: Prove that (something) is false

• debunk: Expose the falseness or hollowness of (an idea or belief):

(Oxford)

Solution 2:

The first word that came to my mind was "torpedoed". The second example at Merriam-Webster is

Her injury torpedoed her goal of competing in the Olympics.

It has more of the negative connotation than the "satisfaction" criteria of the question, but just another option.