Table of Contents POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
ROGET THESAURUS

WORDNET DICTIONARY

Noun slackness has 3 senses

• slackness(n = noun.attribute) inanition, lassitude, lethargy - weakness characterized by a lack of vitality or energy; Array
is a kind of weakness

• slackness(n = noun.attribute) slack - the quality of being loose (not taut); "he hadn't counted on the slackness of the rope"
is a kind of looseness, play
Derived form adjective slack₁

• slackness(n = noun.attribute) laxity, laxness, remissness - the quality of being lax and neglectful; Array
is a kind of neglect, neglectfulness, negligence
Derived form adjective slack₃

CIDE DICTIONARY

ROGET THESAURUS

slackness

Laxity

N laxity, laxness, looseness, slackness, toleration, freedom, anarchy, interregnum, relaxation, loosening, remission, dead letter, brutum fulmen, misrule, license, licentiousness, insubordination, lynch law, nihilism, reign of violence, dethronement, deposition, usurpation, abdication, lax, loose, slack, remiss, weak, relaxed, licensed, reinless, unbridled, anarchical, unauthorized, adespotic.

For further exploring for "slackness" in Webster Dictionary Online