imperceptive

From im- +‎ perceptive.

• Rhymes: -ɛptɪv

imperceptive (comparative more imperceptive, superlative most imperceptive)

1. Unable to perceive.

• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “imperceptive”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.
• “imperceptive”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.