A prefix is an added beginning to a word, which often changes its meaning. If you add the prefix "mis" to spelled, you get the word "misspelled", which means spelled incorrectly. This is, indeed, the antonym, or opposite, of spelled. disable, unable, and enable
The word is spelled unusual, just as you spelled it. "Usual" is the base word, and "un-" is the prefix.
The adding a prefix to the word "add" would result in the word "postadd".
Di-spelled Mis-spelled Re-spelled
You could add the prefix mis- to it to make the word misfits.
The prefix 'im' can added to make the word impolite.
The word is spelled diseases. The root word is "ease" with the prefix "dis-".
The word is spelled consequences. The base word is sequence and "con-" is a prefix.
The word is spelled preview. The base word is view; "pre-" is a prefix.
Pre-The prefix for prefix is pre; because it's before the root word fix.
Prefix is spelled exactly as it was spelled in this question. Mhmmm this guys right.
Monthly doesn't have a prefix. You add the prefix bi- to it to make the word bi-monthly.