| required by law or a firm rule; mandatory |
ambiguous |
| having two or more possible meanings; unclear; uncertain |
compulsory |
| containing salt |
feisty |
| having a lively aggressiveness; energetic; spunky; scrappy |
mundane |
| not flowing (as water); uncirculating; motionless; inactive; dull |
nocturnal |
| dark and gloomy; dismal; gloomy; sad; overly serious |
saline |
| pertaining to the night; active only at night |
somber |
| ordinary; commonplace; of this world; worldly; banal |
stagnant |
