The phrase "wast no avail" means that something was done in vain, without achieving its intended purpose. Its antonyms would be words and phrases that express success or achievement, such as "productive," "fruitful," "effective," "successful," "victorious," "worthwhile," "mattering," "useful," "helpful," "practical," "constructive," "valuable," "beneficial," "advantageous," and "rewarding." These words imply that efforts and actions are not wasted, but rather they have a positive impact, resulting in fruitful outcomes. Using antonyms for "wast no avail" can help us focus on effective actions that bring results, rather than actions that do not matter, helping us achieve our goals and objectives effectively.