What is another word for untenacious?
Pronunciation: [ʌntɛnˈe͡ɪʃəs] (IPA) 
The word "untenacious" means lacking persistence or determination. Synonyms for this word include words such as weak-willed, wavering, indecisive, and irresolute. Other synonyms for "untenacious" might include fickle, flimsy, feeble, half-hearted, and vacillating. These words all describe a lack of steadfastness or a tendency to give up easily. They can be used to describe people, situations, or ideas that lack the consistency or staying power needed to succeed. Consider using some of these synonyms when describing someone who lacks determination or when discussing a situation that seems to lack the strength to endure.
