Adverb
unfeasibly (comparative more unfeasibly, superlative most unfeasibly)
In an unfeasible manner; not feasibly; to a degree that is impossible or impractical.
The orang kaya were forced at gunpoint to sign an unfeasibly arduous treaty, one that was in fact impossible to keep, thus providing Coen an excuse to use superior Dutch force against the Bandanese. Source: Internet
Mass–energy requirement If certain quantum inequalities conjectured by Ford and Roman hold, citation then the energy requirements for some warp drives may be unfeasibly large as well as negative. Source: Internet