The prefix In- can be added to numerable.
Il
Speakable does not have a prefix as it is written. Speakable does have a suffix, -able. A prefix can be added to speakable - unspeakable.
There is no prefix but there is a suffix -ly added to the word passive.Prefixes are added to the beginning of a word eg happy/unhappy prefix is un-
The prefix 'im' can added to make the word impolite.
The prefix 'il' can be used. The complete word would be illogical.
Il
the answer is "in". Innumerable.
The prefix that can be added to "please" is "dis-" to form "displease".
The prefix that can be added to the word "destructive" is "non-."
The prefix that can be added to appointment is "re-", forming the word "reappointment."
Impolite, unpolite
The prefix that can be added to "imperceptibly" is "un-".
The prefix added to "payment" to make it opposite is "non-."
Pre- is a prefix that can be added to the word monition.
The prefix "non-" must be added to form the word "non-poisonous."
The prefix that can be added to the word "integrate" is "dis-", resulting in the word "disintegrate."
"Re" as in reassign or "un" as in unassigned