The antonyms for the word "fullscale" can be many, and they depend on the context in which the word is used. Some common antonyms for "fullscale" include "partial," "incomplete," "limited," "restricted," "inadequate," "insufficient," and "small." Fullscale is a term that implies completeness, comprehensiveness, and an overall fullness of something. Thus, the antonyms represent the opposite, indicating a lack of wholeness, inconsistency, or restrictions. For instance, a full-scale investigation can be opposed to a limited inquiry; a full-scale war can be contrasted with a small conflict, etc. Antonyms are essential in writing, as they can improve sentence fluency and accuracy by conveying a specific meaning.