Thinnish is an adjective used to describe something being moderately thin. It is a versatile word but sometimes could be repetitive or lacks creativity. However, there are many synonyms for the word thinnish that could be utilized to bring a fresh perspective while still conveying the same idea of being moderately thin. Some possible synonyms are slim, slender, lean, skinny, skinny-fat, svelte, gaunt, bony, angular, and lanky. These words are great alternatives to thinnish when trying to express the same idea in a more imaginative and engaging way. By using synonyms, one can add depth to a piece of writing or conversation and make it more varied and rich in vocabulary.