When it comes to describing a challenge, the term "difficulty level" may not always capture the full spectrum of nuance. Other phrases to consider that imply varying degrees of complexity include "level of complexity," "degree of difficulty," "challenging nature," and "level of intricacy." Depending on the context, "hardship level," "complexity rating," or "level of rigor" might also be appropriate synonyms. Meanwhile, more specific descriptors can provide additional context, such as "technical difficulty," "level of risk," or "skill level requirement." Whatever the term used, it's important to select a synonym that accurately conveys the level of challenge involved without being overly vague or confusing.