Final answer:
The metrical foot described is an Anapest, which consists of two unstressed syllables followed by a stressed syllable. It is commonly used in poetry.
Step-by-step explanation:
The metrical foot described in the question is called an Anapest. It consists of two unstressed syllables followed by a stressed syllable (x x /), as in the word 'unimpressed'.
Here are some examples of different metrical feet used in poetry:
- Iamb: an unstressed syllable followed by a stressed syllable (x /), e.g. the word 'forgot'.
- Trochee: a stressed syllable followed by an unstressed syllable (/ x), e.g. the word 'mountain'.
- Dactyl: a stressed syllable followed by two unstressed syllables (/ x x), e.g. the word 'probably'.