concrete

Definitions

A building material made from a mixture of broken stone or gravel, sand, cement, and water, which hardens to a stone-like mass.

Existing in a material or physical form; real or solid rather than abstract.

Specific or definite; not general or theoretical.

Examples

The sidewalk was made of poured concrete that had hardened over time.

We need to come up with a concrete plan before we start the project.

The detective was looking for concrete evidence to prove the suspect's guilt.

Synonyms

tangible solid substantial physical real definite specific

Antonyms

abstract intangible theoretical vague conceptual ideal nebulous