self-deceptive

The compound 'self-deceptive' is a modern English formation that logically combines two established elements. The first, 'self', is a deeply rooted Germanic word for one's own identity. The second, 'deceptive', originates from the Latin verb 'decipere', meaning "to ensnare, to cheat," which itself is built from 'de-' (away) and 'capere' (to take). The adjective-forming suffix '-ive' was added in English. The compound's literal meaning, "misleading to oneself," directly captures the psychological concept of believing one's own falsehoods, illustrating how English can create precise terms by fusing a reflexive prefix with a classical descriptive root.

Structure: self (own) + deceptive (misleading) - self: From Old English 'self', 'seolf', 'sylf', meaning "one's own person." It functions as a prefix indicating reflexivity or application to oneself. - deceptive: From the Latin root 'decept-' (past participle stem of 'decipere', meaning "to deceive") combined with the English adjectival suffix '-ive'. The morpheme 'decept' functions as the core meaning of misleading, and '-ive' indicates a tendency or quality.