Definition: The part or surface that is underneath something; the bottom side of an object.

Example: The underside of the leaf is often a different color than the top side.

Definition: Located or occurring beneath the top layer of something.

Example: The undersurface of the leaf is often a different color than the top side.

Definition: The bottom or lower surface of something, often not visible from the top.

Example: The undersurface of the leaf is usually a different color than the top side.

Definition: To push or insert something beneath another object or layer, often used in geological contexts to describe the movement of rock masses.

Example: The tectonic plates underthrust each other, causing earthquakes.

Definition: Relating to or occurring beneath the surface of water.

Example: The underwater plants provide shelter for many fish.

Definition: Something that cannot be found or noticed; it is not possible to detect it.

Example: The virus was undetectable in the early stages of infection.

Definition: Not discovered or noticed; something that remains hidden or unobserved.

Example: The thief left the scene undetected, avoiding all security cameras.

Definition: Something that cannot be determined or decided.

Example: The outcome of the experiment was undeterminable due to various unpredictable factors.

Definition: Not fully developed or advanced, often referring to regions, economies, or ideas that have not reached their full potential.

Example: The undeveloped area lacked basic infrastructure and services.

Definition: Something that cannot be identified or diagnosed by a doctor or medical professional.

Example: The patient's condition was found to be undiagnosable after several tests.

Definition: Not broken down or processed by the digestive system.

Example: The food remained undigested in his stomach for hours after the meal.