The word "unshakeably" refers to something that is firm or steadfast and cannot be moved or changed. Some possible antonyms for this word may include "shakily," "uncertainly," "insecurely," "haphazardly," "inconsistently," "unreliably," "instably," "warily," "doubtfully," "tentatively," "falteringly," and "hesitantly." These words suggest a lack of confidence, stability, or consistency and may be used to describe situations or individuals who are not firmly settled in their beliefs, feelings, or actions. Antonyms for "unshakeably" imply a sense of change, doubt, or vulnerability and are useful for expressing the opposite of a strong and unwavering position.