1) Again 2) Dual 3) Twice 4) Twofold 1) Double 2) In a double manner 3) In a twofold manner 4) To double the degree 5) To twice the degree 6) Twice 7) Twofold 8) With duplicity 
• (adv.) In twice the quantity; to twice the degree; as, doubly wise or good; to be doubly sensible of an obligation. • (adv.) Deceitfully.
Dou'bly adverb 1. In twice the quantity; to twice the degree; as, doubly wise or good; to be doubly sensible of an obligation. Dryden. 2. Deceitfully. 'A man that deals doubly .' Huloet. 
[adv] - in a twofold manner 2. [adv] - to double the degree
adverb in a twofold manner; `he was doubly wrong`double adverb to double the degree; `she was doubly rewarded`; `his eyes were double bright`
to a double measure or degree: to be doubly cautious. · in a double manner. · with duplicity.