godan verb (-ku)
not do; refrain from doing
Kansai dialect equivalent of しないでおく. Used to express leaving something undone or refraining from doing it, often with a nuance of intentional inaction.
今日はもう何もせんとくわ。
I'm not going to do anything more today.
念のため、余計なことはせんとく。
Just to be safe, I won't do anything unnecessary.
Standard Japanese equivalent. せんとく is the contracted Kansai dialect form.
Contraction of Kansai dialect negative form せん (from しない) + とく (from ておく).