The term 'Lacking Slack' can be described by three words: TENSE, TAUT, and TIGHT. All three words have similar meanings, which is that something is not loose or relaxed. TENSE means to be in a state of mental or emotional strain, TAUT means to be pulled TIGHT, and TIGHT means to be firmly held or fastened. Therefore, the term 'Lacking Slack' implies that something is not loose or relaxed, but rather is strained, pulled TIGHT, or firmly held.