mostwhat

From most +‎ what.

mostwhat (not comparable)

1. (obsolete) mostly; for the most part
   • 1595, Ed. Spencer [i.e., Edmund Spenser], “Colin Clouts Come Home Againe”, in Colin Clouts Come Home Againe, London: […] T[homas] C[reede] for William Ponsonbie, →OCLC:

     All the rest do mostwhat far amiss.

• “mostwhat”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.