Frostian is an adjective that pertains to the style or works of the renowned American poet Robert Frost. Consequently, finding a synonym for frostian can be challenging. Nonetheless, we can use terms such as icy, wintry, bitter, or cold to describe poetic styles, themes, or elements that parallel Frost's work. Other related words include rugged, rural, naturalistic, and pastoral. These words often encompass nature, rural life, and rural settings, which are recurrent in Frost's poetry. Additionally, words such as timeless, contemplative, or introspective can reflect the philosophical and profound themes that Frost's works often explore. Therefore, these terms can suffice as synonyms for Frostian in a literary context.