Word: slackest
(normally said of a rope) Lax; not tense; not firmly extended. Example: a slack rope
Weak; not holding fast. Example: a slack hand
Lacking diligence or care; not earnest or eager. Example: slack in duty or service
Not active,successful, or violent. Example: Business is slack.
Excess; surplus to requirements. Example: the slack capacity of an oil pipeline
Vulgar; sexually explicit, especially in dancehall music.
You can find a list of possible crossword clues for SLACKEST below.