1. Not easily solved
   "public finance...had long presented problems unsolvable or at least unsolved"
   - insolvable, unsoluble, unresolvable

See also: insoluble

• Hyssopus
• Hyssopus officinalis
• hysterectomy
• hysteresis
• hysteretic
• hysteria
• hysteric
• hysterical
• hysterical neurosis
• hysterically
• hysterics
• hysterocatalepsy
• hysteron proteron
• hysterosalpingogram
• hysteroscopy
• hysterotomy
• Hystricidae
• Hystricomorpha
• hythe
• Hytrin
• Hz
• Héloïse
• i
• I beg your pardon
• I Ching