There are plenty of synonyms for the word "strenuouslies" that can be used to convey the same meaning. Some of these synonyms include arduous, tough, challenging, difficult, exhausting, demanding, robust, and vigorous. Each of these words can be used to describe a situation or task that requires the utmost effort and energy to complete successfully. When used in context, these synonyms can provide a more precise and descriptive way of communicating the level of difficulty or challenge involved in a particular activity or undertaking. It's important to choose the right synonym that accurately reflects the level of effort required.