1) Advisedly 2) By choice 3) By design 4) Deliberately 5) In an intentional manner 6) Intentionally 7) On purpose 8) Purposely 9) With intention Found on https://www.crosswordclues.com/clue/designedly
De·sign'ed·ly adverb By design; purposely; intentionally; -- opposed to accidentally , ignorantly , or inadvertently . Found on http://www.encyclo.co.uk/webster/D/46