"Thoughtful" does not have a prefix or suffix. It is a standalone word.
The opposite prefix of the prefix "meta-" is "pre-".
The opposite prefix for personal is "impersonal."
The opposite of median with a prefix is "nonmedian."
The opposite prefix of "essential" is "non-essential."
"Thoughtful" does not have a prefix or suffix. It is a standalone word.
Unthoughtful
inthought
The opposite prefix of the prefix "meta-" is "pre-".
Hypo is the opposite of the prefix hyper.
The opposite prefix for personal is "impersonal."
The opposite of median with a prefix is "nonmedian."
The opposite prefix of "essential" is "non-essential."
The prefix for the opposite of order is "dis-" or "un-".
The opposite of active using a prefix is "inactive."
The opposite prefix of "distinct" is "in-," making the word "indistinct."
The opposite of judge using a prefix is misjudge.