Antonyms of adj unpremeditated

2 senses of unpremeditated

Sense 1
unpremeditated -- (not prepared or planned in advance; "asked an unpremeditated question")

INDIRECT (VIA unplanned) -> planned -- (designed or carried out according to a plan; "the planned outlays for new equipment")

Sense 2
unpremeditated (vs. premeditated) -- (not premeditated)

premeditated (vs. unpremeditated) -- (characterized by deliberate purpose and some degree of planning; "a premeditated crime")
        => aforethought (postnominal), planned, plotted -- (planned in advance; "with malice aforethought")

Similarity of adj unpremeditated

2 senses of unpremeditated

Sense 1
unpremeditated -- (not prepared or planned in advance; "asked an unpremeditated question")
       => unplanned (vs. planned) -- (without apparent forethought or prompting or planning; "an unplanned economy"; "accepts an unplanned order"; "an unplanned pregnancy"; "unplanned remarks")

Sense 2
unpremeditated (vs. premeditated) -- (not premeditated)
       => impulsive -- (without forethought; "letting him borrow her car was an impulsive act that she immediately regretted")
          Also See-> unplanned#1