What is the word for a hard-to-solve solution spoken intuitively, relaxedly and playfully?

Solution 1:

Insightful comes to mind; or introspective if someone has been pondering an abtruse solution to a question given esoteric context.

Solution 2:

With regard to language, the word elegant could be applicable in this scenario.

Especially as per OED definition 2.a.:

Of language, literature, or literary style: characterized by harmonious simplicity in the choice and arrangement of words; free from awkwardness, coarseness, or clumsiness; graceful, refined.

An example phrase:

Judge Moses B. Walker laboriously, but in choice language and elegant phrasing, sought to justify the court's conclusion.

• 1945 Southwestern Hist. Q. 48 463