1. naive:
childlike, credulous, innocent, gullible, simple
2. nauseating:
disgusting, sickening, repeling, offending
3. neurotic:
obsessive, unstable, disturbed, confused, irrational
4. nimble:
lively, agile, active, light, lithe, sprightly
5. nonchalant:
unexcited, cool, unperturbed, dispassionate, undisturbed
6. nondescript:
ordinary, commonplace, undistinctive, unremarkable
7. notorious:
infamous, disreputable, dishonourable, disgraceful, ignominious
8. novice:
beginner, amateur, newcomer, neophyte, learner
9. obeisance:
respect, deference, homage, reverence, honour
10. oblivion:
obscurity, darkness, blankness, nothingness, extinction
11. obnoxious:
revolting, repulsive, repugnant, disgusting, offensive
12. obsolete:
out-date, antiquated, archaic, ancient
13. obstinate:
stubborn, persistent, recalcitrant, tenacious, headstrong
14. officious:
dictatorial, intrusive, meddlesome, interfering, obtrusive
15. opulent:
rich, wealthy, affluent, prosperous
16. ostentatious:
showy, flaunting, boastful, vain, vainglorious, flamboyant