Click the Correct Negative Prefix

For each word shown, click the correct prefix to reverse the word's meaning.
If multiple answers fit, guess the most common one (in American English)
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Last updated: March 29, 2026
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First submittedMarch 23, 2026
Times taken308
Average score83.3%
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stable
perfect
standard
fallible
available
possible
visible
usual
negotiable
rational
reversible
complete
apologetic
realistic
synchronous
probable
surmountable
fortunate
accessible
able
acceptable
usable
secure
intentional
normal
polite
practical
noticeable
fair
feasible
a-
ab-
im-
in-
ir-
non-
un-
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4 Comments
+1
Level 68
Mar 26, 2026
A- needs justice. Only once use is crazy
+1
Level 71
Mar 29, 2026
great quiz

please accept unfeasible though, which is common; have never heard infeasible 🫠

+2
Level 62
Mar 29, 2026
Some of these words have more than one option: in/un-stable, non/un-negotiable, in/un-feasible.
+2
Level 86
Mar 30, 2026
"Unsecure" is also a valid word, particularly in tech