12 letter adjectives that start with O

We have listed 71 12-letter adjectives that start with O for you in this WordMom word list. All these 12-letter adjectives starting with O were verified by specialists in the English language.

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  • obstreperous
  • oblanceolate
  • obligational
  • obcompressed
  • obliterative
  • obreptitious
  • obtusangular
  • occupational
  • octogenarian
  • octosyllabic
  • octosyllable
  • octopetalous
  • ochroleucous
  • octostichous
  • octoradiated
  • octospermous
  • occasionable
  • oenanthylous
  • oligarchical
  • omnispective
  • onomatopoeic
  • oneirocritic
  • onagrarieous
  • opinionative
  • ophiological
  • ophiophagous
  • opiniastrous
  • operculiform
  • orthographic
  • orchestrated
  • orthopedical
  • orthotropous
  • organicistic
  • orthomorphic
  • orographical
  • orthopterous
  • orthorhombic
  • orthosilicic
  • orchidaceous
  • organoleptic
  • orthoclastic
  • ornithologic
  • orichalceous
  • orthognathic
  • orthodoxical
  • ostentatious
  • osteogenetic
  • osteological
  • osteoplastic
  • otherworldly
  • outstretched
  • overreaching
  • overwhelming
  • overcautious
  • overpowering
  • overburdened
  • overgenerous
  • overcritical
  • overabundant
  • overdelicate
  • overfamiliar
  • overturnable
  • overmalapert
  • overfrequent
  • overfruitful
  • overrigorous
  • overnumerous
  • overtroubled
  • overluscious
  • overstudious
  • oxygenizable

12 letter adjectives that start with