The paper focuses on the cognitive foundation of the English adjectives that denote moral characteristics of human beings. Word semantics is treated as a two-level phenomenon that comprises the semantic (external) level and the conceptual (deep) one. The modelling of the adjective conceptual basis is also based on the etymological data. The etymological data have revealed that the conceptual basis of the English adjectival category of ‘moral qualities’ is formed by a certain set of conceptual oppositions, such as LIFE — DEATH, MOTION — STILLNESS, FRIEND — FOE, LOVE — HATRED, and so forth. These oppositions vary in terms of productivity, the most productive being the opposition FRIEND — FOE; it produced 25 % of the adjectives. Since ...