SLACK — СИНОНІМІЯ

slack the condition of being loose (not taut)

WordNet

slack a noticeable deterioration in performance or quality

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slack cause to heat and crumble by treatment with water

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slack become less in amount or intensity

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slack make less active or intense

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slack become slow or slower

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slack make less active or fast

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slack lacking in rigor or strictness

lax
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slack lacking in strength or firmness or resilience

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slack not tense or taut

WordNet