1) Effectively 2) Energetically 3) Firmly 4) Forcefully 5) Hard 6) Impressively 7) In a powerful manner 8) In emphatic manner 9) Mightily 10) Powerfully 11) Robustly 12) Securely 13) Solidly 14) Vigorously 15) With force Found on https://www.crosswordclues.com/clue/strongly
• (adv.) In a strong manner; so as to be strong in action or in resistance; with strength; with great force; forcibly; powerfully; firmly; vehemently; as, a town strongly fortified; he objected strongly. Found on http://thinkexist.com/dictionary/meaning/strongly/
Strong'ly adverb In a strong manner; so as to be strong in action or in resistance; with strength; with great force; forcibly; powerfully; firmly; vehemently; as, a town strongly fortified; he objected strongly . Found on http://www.encyclo.co.uk/webster/S/213
adverb with strength or in a strong manner; `argues very strongly for his proposal`; `he was strongly opposed to the government` Found on https://www.encyclo.co.uk/local/20974