slack Antonyms

procrustean struggle swamped taut tenacious tense tension tensioned tight tighten torqued tuff tumultuous ultraist unflexible unlimber unswayable vaulting striving stringent strict puristic raging rapid remunerated renitent restrictive rheumatic rigid rigorist rigorous riotous sedulous sequestrate snug spangled stiff stressful virgate washboard wedged ohmic rainproof rip-roaring rockbound rock steady rodlike semirigid skin-tight stormproof