Slack, adj. remiss, backward, not eager: “be thou not s. to proffer, though she put thee back,” Pilgr. 333. “I shall not be s.” Shr. I, 2, 275. “if thou be s., I'll fight it out,” H6A I, 1, 99. “I will not be s. to play my part in Fortune's pageant,” H6B I, 2, 66. “the duke shall know how s. thou art,” R3 I, 4, 282. “so s., so slow,” Per. IV, 2, 68. to come s. of == to be remiss in: “if you come s. of former services,” Lr. I, 3, 9.