Lewis & Short

* sub-diffĭcĭlis, e, adj., somewhat difficult: quaestio, Cic. Lael. 19, 67.

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• subdĕalbo
• subdēbĭlis
• subdēbĭlĭtātus
• subdēfectĭo
• subdēfĭcĭo
• subdēlĭgo
• subdescendo
• subdĭăcŏnus
• subdĭālis
• subdīvālis
• subdĭālĭa
• subdiffĭcĭlis
• subdiffīdo
• subdīmĭdĭus
• subdisjunctĭo
• subdisjunctīvus
• subdistinguo
• subdĭtīcĭus
• subdĭtītĭus
• subdĭtīvus
• Subdĭtīvus
• subdĭto
• subdĭtus
• ...