Post any 13 letter words you know of!
heres my list:
International
Philosophical
Photographers
Cross-country (including hyphen)
Psychiatrists
Circumstances
Individuality
Educationally
Condescending
Antibacterial
Disappearance
Unfortunately
Blood-covered (including hyphen)
Hallucinating
Hallucination
Macromolecule
novercaphobia
13 Letter Words (not including spaces)
Concentration
Granddaughter
Understanding
Victricophobia
Autobiography
Non-Important (including hyphen)
Destabilizing
Establishment
Opportunities
Comprehensive
Halfrecumbent
Contradiction
Supplications
Affectionately
Indescribable
Undescribable
Uncomfortably
Conciousness
Raciocination
Carbohydrates
Sportsmanship
Concentrating
Concentration
Unfantabulous
Old-fashion (including hyphen)
Bluminesence
Unlegisiative
Inflexibility
Inflorescence
Ingeinousness
Perseverance
Investigation
Unnutritional
Unglassesless (my friend said that I was unglassesless and im like oh thats 13 letters!)
Geostationary
Ventriloquism
Foolhardiness
Thats all for now

Post yours please!