The term 'without any slack' can be described by two words: TAUT (4 letters) and tautly (6 letters). TAUT is an adjective meaning 'tightly stretched or pulled, ' while tautly is an adverb meaning 'in a TAUT manner.' This phrase is often used to describe a situation where there is no room for error, or when something is done with precision and accuracy. For example, a rope that is tautly tied will not have any slack, and a job that is done without any slack means it was done perfectly.