The prefix part of the word dismayed is 'dis-'. If the prefix is 'un-' it means the opposite of dismayed; not dismayed: undismayed.
UN-dismayed
* Correction - Not every word can receive a prefix to create a proper word. Using the prefix "un" specifically means to undo or remove a condition or function. This cannot be done using "un-dismay". Dismay is an emotion, similar to disappointment, and its opposite is elated or delighted. These opposites cannot be created by using a prefix with the word "dismayed".
Although the word "dismay" appears to have the prefix "dis", it cannot be considered a prefix today. The different versions of the word "may" and "migh", with many spellings had meaning of might and courage hundreds of years ago. At that time, the "dis" served as a prefix to indicate a lack of courage or might.
Today, the word meanings have changed and "dis" is no longer a prefix, it is an integral part of the word dismay. However, dismayed does include the suffix "ed".
I really don`t know. Sorry!!!!!
Dis-
It means not or against.
undismayed
dis
un
Gladdened.
Glad, Overjoyed, Joyous, Happy,
UNfreeze
Hypo is the opposite of the prefix hyper.
The prefix in the word upgrade is 'up'. The opposite would be downgrade.
Gladdened.
Glad, Overjoyed, Joyous, Happy,
The prefix added to the word "approve" to make it its opposite is "dis-", resulting in the word "disapprove."
Dis-comfort
UNfreeze
un as in unbolt.
Im- is the correct prefix. This would make the word immature.
Hypo is the opposite of the prefix hyper.
The prefix "in" could be used to make the opposite word insufficient.
The opposite prefix of the prefix "meta-" is "pre-".
The prefix for "counteract" is "counter-".
The prefix in the word upgrade is 'up'. The opposite would be downgrade.