ˈdəb(ə)lē, -li adverb
Etymology: Middle English, from double (I) + -ly
1.
a. : to twice the degree : in twice the quantity
this responsibility is doubly heavy — Hunter Mead
would now be doubly certain to investigate — T.B.Costain
b. : in a twofold manner : in two degrees — used chiefly in botany
doubly crenate
doubly dentate
2. obsolete : in a deceitful manner : dishonestly
they lay a man under a necessity to deal doubly with them — Samuel Richardson