Question

no tear could melt his stony heart explain and figure of speech​

Answer 1

The figure of speech is metaphor.

• The metaphor is a casual or inferred simile. Here the words, as, in this way, and so forth, which are utilized in comparison to show plainly the resemblance between two things, diverse in kind, are dropped.
• The comparison exists implied in an illustration in articulation of character between two unique articles. In the given sentence, the adjectives heart and stony are impliedly compared.
• Thus, the sentence no tear could melt his stony heart is a metaphor.