Slow in understanding or discernment; dull: "a purblind oligarchy that flatly refused to see that history was condemning it to the dustbin"(Jasper Griffin).
Obsolete Completely blind.
[Middle English pur blind, totally blind, nearsighted : pur, pure; see pure + blind, blind; see blind.] pur'blind'ly adv., pur'blind'ness n.