That man's monstrously strong.
Source: tatoeba (328697)
Ranked by relevance and common usage.
Keep "monstrously" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
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4 total sentences available.
That man's monstrously strong.
Source: tatoeba (328697)
All these traditions are monstrously outdated.
Source: tatoeba (11953975)
She went about the house in a state of real terror, and yet lied monstrously and wilfully, and invented many of the alarms she spread, and made many of the sounds we heard.
Source: wiktionary
This does become monstrously antimusical in one scene: when Tchaikovsky’s music, softly depicting the sleeping palace (my favorite passage of this composer’s entire oeuvre, with its beautifully muffled oboe melody suggesting how beauty ripens in sleep like a chrysalis), is turned into an epic battle for the poor passive Prince, conducted between the wicked Carabosse, with her ghoulish minions, and the Lilac Fairy, with her elves.
Source: wiktionary
Closest matches include abjectly, abominably, appallingly, arrantly, atrociously.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.