Webster's Revised Unabridged Dictionary · 1913

Irresolvable

Irresolvable , adjective

[Prefix ir- not + resolvable. Compare Irresoluble.]

Incapable of being resolved; not separable into component parts.
Collocations (1)
Irresolvable nebula (Astronomy) , nebula of a cloudlike appearance, which have not yet been resolved by the telescope into stars, and are often distant galaxies. See galaxy{2}.