This is the 12222nd most frequent Russian word.
интеллектуального
"Intellectual."
The word "интеллектуального" is used as an adjective modifying the noun "потенциала" to denote an attribute related to intellect.
Он интересуется развитием интеллектуального потенциала.
He is interested in the development of intellectual potential.
Here, "интеллектуального" describes the quality of the noun "свойства," indicating it's related to intellect.
Книга посвящена вопросам интеллектуального свойства.
The book is dedicated to topics of intellectual nature.
In this sentence, "интеллектуального" describes "усилия" to specify the type of required effort.