shallow

The primary image is a lack of vertical depth, whether physical or metaphorical. In its literal sense, it describes water or containers where the bottom is easily reached. When applied to people or ideas, it carries a strong negative connotation of superficiality. It suggests a person who cares only about appearances (like wealth or beauty) and lacks emotional or intellectual complexity. Unlike 'simple', which can be positive, 'shallow' implies a deficiency or a failure to engage with the truth. In a physiological context, it describes restricted movement—specifically breathing that doesn't reach the lungs' full capacity. This is typically associated with stress, panic, or physical exhaustion.