Questions & Answers about הוא נראה די עייף היום, אבל הוא בכל זאת בא לפגישה.
Here נראה means looks, seems, or appears.
So הוא נראה די עייף is literally something like he appears quite tired. In natural English, he looks pretty tired is a very good match.
Grammatically, נראה is the masculine singular present form, matching הוא.
Because it has to agree with הוא, which is masculine singular.
So:
- הוא נראה די עייף = masculine singular
- היא נראית די עייפה = feminine singular
Hebrew adjectives usually change form to match gender and number.