What is the term for unrhymed iambic pentameter, containing lines of ten syllables that do not rhyme?

The term for unrhymed iambic pentameter consisting of lines with ten syllables is indeed blank verse. This form is characterized by its rhythmic structure, following the pattern of iambic pentameter, which means each line has five pairs of syllables, with the first syllable unstressed and the second stressed. Unlike other forms of verse that may include rhyme, blank verse is unique because it does not feature any rhyme scheme, allowing for a more natural flow of speech. This has made it a favored style among many playwrights and poets, particularly in English literature, as it imitates the rhythms of normal speech while maintaining a poetic quality.

Other options provided, such as free verse, prose, and stanza, do not accurately describe the specific characteristics of blank verse. Free verse disregards traditional meter and rhyme altogether, prose is written in ordinary formation without a structured poetic form, and a stanza refers to a grouped set of lines in a poem or song, rather than a specific meter or rhythmic pattern. Hence, recognizing the defining features of blank verse differentiates it from these other terms.