The phrase "held in" can refer to various things, including emotions, secrets, or events. Fortunately, there are many synonyms that can be used to express the same idea. Some of the possible words that can be used to replace "held in" include suppressed, repressed, concealed, contained, and bottled up. Other options include restrained, controlled, held back, reserved, and guarded. Depending on the context, other words may also work, such as hidden, kept quiet, or kept to oneself. Regardless of the specific word chosen, using a synonym for "held in" can add variety and depth to your writing, allowing you to convey your ideas in a more nuanced way.