| Word | Definitions | Synonyms |
|---|---|---|
| fecal | (adjective) of or relating to feces | Synonyms: faecal |
| feckless | (adjective) generally incompetent and ineffectual | Synonyms: inept |
| (adjective) not fit to assume responsibility | - | |
| feculent | (adjective) foul with waste matter | - |
| fecund | (adjective) capable of producing offspring or vegetation | - |
| (adjective) intellectually productive | Synonyms: fertile, prolific |