1. trivial   UNPRECEDENTED   SLUGGISH   TRIFLING   STOIC   Hint Half-n-half Clue   2. changing rapidly   SERVILE   TURBID   VOLATILE   STRIDENT   Half-n-half Clue   3. saying very little   TURBID   STEADFAST   TACITURN   SUBORDINATE   Half-n-half Clue   4. untidy   UNOBTRUSIVE   TACITURN   UNKEMPT   VIABLE   Half-n-half Clue   5. easily affected   VOLATILE   SAVORY   TANTAMOUNT   SUSCEPTIBLE   Half-n-half Clue   6. stolid   TRIFLING   SOMBER   TURBID   STOIC   Half-n-half Clue   7. shallow   VOLUBLE   SUPERFICIAL   TRITE   STRIDENT   Half-n-half Clue