This is the 15136th most frequent Russian word.
полноценных
"Полноценных" means "full-fledged" or "complete" in English.
Here, 'полноценных' describes 'продуктов' (products), emphasizing their complete, wholesome nature.
Хорошая диета требует употребления полноценных продуктов.
A good diet requires consumption of whole products.
In this sentence, 'полноценных' modifies 'объяснений' (explanations), suggesting their adequacy and thoroughness.
Полноценных объяснений по этому вопросу не предоставлено.
Full explanations on this matter have not been provided.
The word 'полноценного' indicates the quality of the 'rest' being complete and fulfilling.