Definition of unperceiving in US English:

unperceiving

adjective

  • Not perceiving or capable of perceiving; (especially in early use) lacking in perception or insight; unperceptive.

Origin

Early 17th century; earliest use found in Owen Felltham (?1602–1668), essayist and poet. From un- + perceiving.

Pronunciation

unperceiving

/(ˌ)ʌnpəˈsiːvɪŋ/