Pronunciation: [dˈɪmɪʃ] (IPA) 
The word "dimmish" is a variation of the adjective "dim", which means lacking in brightness, or not very bright. The spelling of "dimmish" can be explained using IPA phonetic transcription: /ˈdɪm.ɪʃ/. The first syllable is pronounced like "dim", followed by the schwa sound, "ə", and ending with a short "ish" sound, "ɪʃ". "Dimmish" is not a commonly used word, but it can be useful to describe something that is slightly dimmer than usual.
Dimmish is an adjective that refers to something that is faintly or partially dim, or having a diminished level of brightness or intensity. It describes a quality, appearance, or condition that is characterized by a slight reduction in luminosity, clarity, or vigor.
When used to describe lighting, dimmish suggests an illumination that is not fully bright or vibrant, but rather somewhat subdued or muted. It denotes a diminished level of brilliance or radiance, often resulting in a tranquil or cozy atmosphere. This term is commonly used when referring to the soft and gentle glow of low-level lighting, such as a dimmish lamp or a dimmish candlelight.
Figuratively, dimmish can be used to describe something that lacks vitality, vigor, or vivacity. It signifies a muted or subdued state, where there is a limited level of energy, enthusiasm, or dynamism. For example, a party that initially had a lot of excitement and buzz can become dimmish as it progresses and people start to tire. Similarly, a previously radiant and vibrant performance can gradually become dimmish as fatigue sets in.
Overall, dimmish implies a state of reduced brightness, clarity, or intensity either literally or figuratively, conveying a sense of subdued or diminished quality, atmosphere, or condition.
Somewhat dim.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
