Synonyms, Grades 11–12: Unpredictable

Learn this list of synonyms for unpredictable.
24 words 0 learners

Learn words with Flashcards and other activities

Definition First
Print Flashcards

Other learning activities

Answer a few questions about each word. Use this to prep for your next quiz! Compete with other teams in real time to see who answers the most questions correctly! Test your spelling acumen. Read the definition, listen to the word and try spelling it!

Teaching tools

Create and assign quizzes to your students to test their vocabulary. Assign learning activities including Practice, Vocabulary Jams and Spelling Bees to your students, and monitor their progress in real-time.

Full list of words from this list:

words only definitions & notes
  1. fickle
    liable to sudden unpredictable change
  2. capricious
    determined by chance or impulse rather than by necessity
  3. volatile
    tending to vary often or widely
  4. mercurial
    liable to sudden unpredictable change
  5. variable
    liable to or capable of change
  6. inconstant
    likely to change often without apparent reason
  7. unreliable
    dangerously unstable and unpredictable
  8. treacherous
    dangerously unstable and unpredictable
  9. vacillating
    uncertain in purpose or action
  10. flighty
    unpredictably excitable (especially of horses)
  11. fluctuating
    having unpredictable ups and downs
  12. labile
    liable to change
  13. spontaneous
    happening or arising without apparent external cause
  14. temperamental
    likely to perform unpredictably
  15. wayward
    unpredictable; following no clear pattern
  16. protean
    taking on different forms
  17. erratic
    liable to sudden unpredictable change
  18. skittish
    not steady or reliable; apt to change suddenly
  19. quicksilver
    liable to sudden unpredictable change
  20. unstable
    subject to change; variable
  21. whimsical
    determined by chance or impulse rather than by necessity
  22. arbitrary
    based on or subject to individual discretion or preference
  23. impulsive
    determined by chance or whim rather than by necessity
  24. mutable
    capable of or tending to change in form or quality or nature
Created on Tue Mar 10 10:45:02 EDT 2026 (updated Tue Mar 10 10:50:02 EDT 2026)

Sign up now (it’s free!)

Whether you’re a teacher or a learner, Vocabulary.com can put you or your class on the path to systematic vocabulary improvement.