Cognitive linguists have not paid much attention to the conceptual semantics of basic adjectives used predicatively about physical objects, concentrating mainly on attributive constructions (e.g., adjective ordering, interactions between adjective and noun) or on figurative uses. Among the exceptions are Anna Wierzbicka (2006) on ‘shape’ descriptors and Goddard & Wierzbicka (2007) on ‘physical quality’ descriptors, both conducted within the NSM framework of semantic-conceptual analysis. Building on this work, the present article proposes original semantic-conceptual explications for the basic physical meanings of ‘long’, ‘flat’, ‘round’, ‘hard’, ‘heavy’, and ‘sharp’. The project has high significance because it can be argued that these meanings function as conceptual building blocks in the semantics of innumerable other words and concepts in the realm of the physical. The article showcases cutting-edge work in NSM semantics, including introducing the notion of ‘visuospatial parsing’ into NSM research and emphasizing the importance of embodied experience in human conceptualization.