Webster's 1828 Dictionary
PREMEDITATED
pp. Previously considered or meditated. 1. Previously contrived, designed or intended; deliberate; willful; as premeditated murder.
American Oxford Thesaurus
premeditated
premeditated adjective the premeditated murder of Lady Boswell: planned, intentional, deliberate, preplanned, calculated, cold-blooded, conscious, prearranged. ANTONYMS spontaneous.
Oxford Thesaurus
premeditated
premeditated adjective premeditated murder: planned, intentional, intended, deliberate, pre-planned, calculated, cold-blooded, conscious, done on purpose, wilful, prearranged, preconceived, considered, studied, purposive; Law, dated prepense. ANTONYMS accidental, unintentional; spontaneous.
Sanseido Wisdom Dictionary
premeditated
pre med i tat ed /prɪmédɪtèɪtɪd /形容詞 前もって考えた, 計画的な ▸ (a ) premeditated murder 計画殺人