Entry 1 sense Webster, 1913 Simious · Sim·i·ous · IPA /ˈsɪm.i.əs/ 01 a. Of or pertaining to the Simiæ; monkeylike. 1. Of or pertaining to the Simiæ; monkeylike.(Zool.) “That strange simious, schoolboy passion of giving pain to others.” — Sydney Smith.