Longman Dictionary of Contemporary English - lightly

~ adv 1 with only a small amount of weight or force; gently  (Martin kissed his bride lightly on the cheek.) 2 using or having only a small amount of something  (Rub a casserole lightly with olive oil. | lightly armed soldiers) 3 without worrying, or without appearing to be worried  (Ma chuckled lightly and went back upstairs.) 4 done without serious thought  (take sth lightly)  (Divorce is not a matter you can afford to take lightly.) 5 escape/get off lightly to be punished in a way that is less severe than you deserve