1 boundless

2 vast and obscure

1 vast and indistinct

2 perplexed

3 bewildered

4 at a loss

1 Hohhot prefecture-level city, capital of Inner Mongolia autonomous region 內蒙古自治區|内蒙古自治区[Nèi měng gǔ Zì zhì qū]

1 vast

2 great

3 large amount

1 vast

2 expansive (universe)

3 torrential (floods)

1 the hazy dusk of twilight (idiom)

1 vast as the open sea (idiom); fig. extensive (library)

1 sea of bitterness is vast (idiom)

1 at a loss (idiom)