Final answer:
Grendel is portrayed as a menacing and feared character in lines 435-438 of the poem.
Step-by-step explanation:
In lines 435-438, the reader can infer that Grendel is a menacing and feared character. The language used to describe him, such as 'fierce eyes' and 'great bird of prey,' creates a vivid image of a terrifying creature. Additionally, the actions of Grendel, such as shaking his fist at a child and instilling fear in those around him, further emphasize his menacing nature.