"Lackest" is a word used to describe someone or something that is lacking in a particular quality or quantity. However, there are several synonyms that can be used in its place depending on the context. Some of the synonyms for "lackest" include "deprived," "absent," "deficient," "scarce," "wanting," and "shortage of." For instance, instead of saying "you lack motivation," one may say "you are deficient in motivation." Similarly, instead of saying "there is a lack of resources," one may use "there is a scarcity of resources." In summary, using synonyms can help in avoiding redundancy and adding variety to one's vocabulary.