The antonyms for the word "alltime" are temporary, limited, occasional, and sporadic. These words indicate that something is not permanent, ongoing or continuous. When we use the term "alltime," we refer to something that is considered the best or most significant of all time. However, the opposite of this would be something that is not noteworthy or relevant in the long-term. For instance, "temporary" refers to something that lasts for a short period and has no lasting impact. "Limited" suggests that something is restricted or confined in some way, whereas "occasional" and "sporadic" imply that something occurs infrequently or irregularly. Therefore, these antonyms reveal that the "alltime" is a unique and valuable term.