Synonym: baggy, droopy, dull, hanging, inactive, lax, lazy, loose, slow. Antonym: tight. Similar words: slacken, lack, black, flack, lackey, blacken, lacking, black out. Meaning: [slæk] 
n. 1. dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve 2. a noticeable deterioration in performance or quality 3. a stretch of water without current or movement 4. a soft wet area of low-lying land that sinks underfoot 5. the condition of being loose (not taut) 6. a cord or rope or cable that is hanging loosely. v. 1. avoid responsibilities and work, be idle 2. be inattentive to, or neglect 3. release tension on 4. make less active or fast 5. become slow or slower 6. make less active or intense 7. become less in amount or intensity 8. cause to heat and crumble by treatment with water. adj. 1. not tense or taut 2. lacking in strength or firmness or resilience 3. flowing with little speed as e.g. at the turning of the tide 4. lacking in rigor or strictness.
n. 1. dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve 2. a noticeable deterioration in performance or quality 3. a stretch of water without current or movement 4. a soft wet area of low-lying land that sinks underfoot 5. the condition of being loose (not taut) 6. a cord or rope or cable that is hanging loosely. v. 1. avoid responsibilities and work, be idle 2. be inattentive to, or neglect 3. release tension on 4. make less active or fast 5. become slow or slower 6. make less active or intense 7. become less in amount or intensity 8. cause to heat and crumble by treatment with water. adj. 1. not tense or taut 2. lacking in strength or firmness or resilience 3. flowing with little speed as e.g. at the turning of the tide 4. lacking in rigor or strictness. 
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121. Whereas Donald chose to impart the news himself that Mr McCrindle's fence had gone slack.
122. People in San Francisco seem to have no slack in their lives anymore.
123. Thus, in times of slack demand it is not uncommon to find managements tightening up on industrial discipline.
124. Of course, Tam and Richie hadn't helped matters by building a fence that went slack.
125. But such cases were not, as the council claimed, the result of slack administration by the chief steward.
126. He was tall and gangling with a slack mouth and appeared to be holding something behind his back.
127. Then she lowered it until she heard a splash and the rope went slack.
128. She was lolling in bed, her mouth wet and slack like a gormless child's.
129. She lived like you do, a dozen slack rope-ends in each dream hand, tugging uselessly on memory or hope.
130. It was not as though she had been slack in her church attendance in the past.
131. This can result due to reductions in overmanning and improvements in other types of slack management procedures.
132. High slack systems are those organizations operating with an abundance of resources in reasonably stable and minimally competitive environments.
133. Watching a youth in a blue tunic and spangles performing on the slack rope, he determined to attempt a similar feat.
134. He had one of those poor beards, the kind that camouflage a slack jaw.
135. But this week,(http://sentencedict.com/slack.html) you should try to curb your impatience with those who are slack in their work.
136. What she needs is for the father of her children to pick up some slack.
137. I guess I thought that since everything was starting to turn around, I could slack off a little.
138. Saliva flew in a spray from hideously enlarged and slack lips.
139. We were rushing back to deal with Mr McCrindle's fence because it had gone slack, and for that reason only.
140. As opposed to Ralph, who, head tilted, mouth slack, looked for all the world like some one in love.
141. The other jobs have some slack in them and this can be calculated as in Figure 6.7.
142. Dad may be under particular pressure to complete a project at a time when mom has more slack.
143. Savings and loan institutions, for example, were once high slack systems, and appropriately so in a regulated industry.
144. Her body went momentarily slack with relief, or was it disappointment?
145. Many of her leadership behaviors seen as productive in the low slack system prove ineffective in the high slack company.
146. It is a profitable business but there is evidence of some slack time, perhaps this is a learning curve effect.
147. It did not slack in the least until Centreville was reached.
148. But trade was slack so he made his way to London to seek his fortune.
149. He kept hands in work after their most productive years and was reluctant to dismiss them when trade was slack.
150. Some areas are slack in slipway and dock.
More similar words: slacken, lack, black, flack, lackey, blacken, lacking, black out, for lack of, blackleg, blacking, jet black, blackball, black hand, black hole, in the black, black list, black sheep, blackbody, blackface, blackmail, blacklist, blackness, lacklustre, blacksmith, lackluster, a black sheep, blackberry, black magic, black horse.