Adjective
Capable of being disproved or refuted.
Source: Webster's dictionaryFor example, the Banach–Tarski paradox is neither provable nor disprovable from ZF alone: it is impossible to construct the required decomposition of the unit ball in ZF, but also impossible to prove there is no such decomposition. Source: Internet
Questions remain whether or not the meme concept counts as a validly disprovable scientific theory. Source: Internet