1. TENTATIVE   conscientious   not certain   bitterly hostile   gloomy   Hint Half-n-half Clue   2. TACITURN   gloomy   capricious   saying very little   of lesser rank   Half-n-half Clue   3. STOIC   excessive   saying very little   unjustified   stolid   Half-n-half Clue   4. SUCCINCT   swollen   stealthy   cautious   terse   Half-n-half Clue   5. SOMBER   talkative and fluent   gloomy   swollen   trivial   Half-n-half Clue   6. TURBID   muddy or cloudy   easily affected   barely enough   diplomatic   Half-n-half Clue   7. UNOBTRUSIVE   talkative and fluent   inconspicuous   capricious   cautious   Half-n-half Clue