mediocre in WordNet English dictionary

1. lacking exceptional quality or ability
   "a novel of average merit"; "only a fair performance of the sonata"; "in fair health"; "the caliber of the students has gone from mediocre to above average"; "the performance was middling at best"
   average  fair  mediocre  middling 
   
2. poor to middling in quality
   "there have been good and mediocre and bad artists"
   mediocre 
   
3. moderate to inferior in quality
   "they improved the quality from mediocre to above average"
   mediocre  second-rate