Of a person: mistaken, in error.

That misunderstands or misconceives; erring. Now rare.

That misconceives; having false notions. Also (causatively): liable to produce misconception; misleading.

Wrongly or erroneously conceived; (in later use) spec. badly planned or devised.

That misconstrues.

Misconceived, wrongly supposed. Also with of.

Of a person or persons: having a wrong opinion or judgement; labouring under a misapprehension.

That misunderstands.

Apt to misconstrue.

Apt to misapprehend.