deliberately

dɪˈlɪb(ə)rətli

adverb

consciously and intentionally; on purpose.

the fire was started deliberately

intentionally,on purpose,purposely,by design,knowingly,wittingly,consciously,purposefully,premeditatedly,calculatedly,in cold blood,wilfully,wantonly,with malice aforethought,carefully,unhurriedly,steadily,evenly,measuredly,cautiously,slowly,laboriously,ponderously