The given passage describes a scene that is most likely taking place during the season of winter.

Explanation:
1. Description of the scene:
The passage begins by stating that "seems to one in drowsiness half lost," which suggests a sleepy and hazy atmosphere. This sleepy feeling is often associated with winter when the weather is cold and the days are shorter. The scene is further described as the grasshopper being "among some grassy hills." This imagery of grassy hills can be associated with winter as well, where the grass is usually dormant and not as vibrant as in other seasons.

2. Drowsiness and half lost:
The line "seems to one in drowsiness half lost" adds to the sense of winter. In winter, the days are shorter, and the lack of sunlight can make people feel drowsy and lethargic. The phrase "half lost" could also refer to the bareness of the landscape during winter, where the trees have lost their leaves and the grass has withered.

3. The grasshopper:
The mention of the grasshopper in the passage further supports the idea that the scene is set in winter. Grasshoppers are usually associated with warmer seasons, particularly summer when they are known for their chirping and hopping in meadows. However, in this passage, the grasshopper is described as being "among some grassy hills," which suggests a less lively and active grasshopper. In winter, grasshoppers become less active or even dormant due to the cold temperatures.

4. Conclusion:
Based on the description of a sleepy and drowsy atmosphere, the presence of grassy hills, and the mention of a less active grasshopper, it can be concluded that the scene described in the passage is most likely set in winter. Winter is characterized by its cold weather, shorter days, dormant grass, and the hibernation or reduced activity of various animals, including grasshoppers.