If a statement is based on an assumption or belief

Noah

If a statement is based on an assumption or belief

In this context ‘Presumably, determining the cause of death proved to be a formidable challenge’, which expressions can replace ‘presumably’?
In the context you provided, “presumably” indicates that the statement is based on an assumption or likelihood. If you want to replace “presumably” with a different expression, here are some options:

• Ostensibly
• Supposedly
• Allegedly
• It can be assumed
• It is likely
• It is probable
• It is presumed
  

These alternatives convey a similar meaning to “presumably” by suggesting that the information or statement is based on an assumption or belief. Choose the one that best fits the context and conveys the intended meaning.