| adj. | 1. | |
| n. | 1. | The act or process of acquiring desirable qualities by being left undisturbed for some time. |
| Noun | 1. | mellowing - the process of becoming mellow |
| Adj. | 1. | mellowing - having or suggesting softness and richness in quality; "a mellow sound"; "the mellow air brought in the feel of imminent autumn"- Thomas Hardy; "a mellowing sun" Synonyms: mellow |