1) By all odds 2) Decidedly 3) Definitely 4) In spades 5) Unquestionably 1) Completely 2) Decidedly 3) Definitely 4) Firmly 5) Ohso 6) Vigorously 
• (adv.) With emphasis; forcibly; in a striking manner or degree; preeminently. • (adv.) Not really, but apparently.
Em·phat'ic·al·ly adverb 1. With emphasis; forcibly; in a striking manner or degree; preëminently. « He was indeed emphatically a popular writer.» Macaulay. 2. Not really, but apparently. [ Obsolete] Sir T. Browne. 
emphatically 1. Without question and beyond doubt. 2. With great force or definiteness. 3. Used to reinforce the accuracy or appropriateness of a description.
without question and beyond doubt