1. virtue   TREPIDATION   VACILLATION   TURPITUDE   TREMULOUS   Hint Hint       2. slothful   TURBID   UNIMPEACHABLE   UNSEEMLY   SEDULOUS   Hint       3. youthfulness   TREMULOUS   SENILITY   VENIAL   TUMULT   Hint       4. conceal   TRANSIENT   UNEARTH   TRANQUILLITY   VENIAL   Hint       5. moribund   TURGID   UNWITTING   VAUNTED   VIABLE   Hint       6. peaceful   SENILITY   TRUCULENT   TURBULENT   TRACTABLE   Hint       7. serenity   TUMULT   TURBULENT   TRUCULENT   TRITE   Hint