"having the quality of looking within," 1820 (Southey), from Latin introspect-, past participle stem of introspicere "look into, look at" (see introspection) + -ive. Related: Introspectively; introspectiveness.
introjection
intron
introrse
introspect
introspection
introspective
introversion
introvert
introverted
intrude
intruder