i·dée fixe 
(ē-dā fēks)
(ē-dā fēks)n. pl. i·dées fixes (ē-dā fēks)
A fixed idea; an obsession.
[French : idée, idea + fixe, fixed.]
- irreligion
- irreligious
- irreligiously
- irreligiousness
- irremeable
- irremediable
- irremediably
- irremissibility
- irremissible
- irremissibly
- irremovability
- irremovable
- irremovably
- irreparability
- irreparable
- irreparableness
- irreparably
- irrepealable
- irreplaceability
- irreplaceable
- irreplaceableness
- irreplaceably
- irrepressibility
- irrepressible
- irrepressibleness