The word opposite to regular is irregular.
irregular
Ir- can be a prefix for regular: irregular.
"Joined" is a regular verb in English. It follows the standard verb conjugation rules for regular verbs, such as adding "-ed" to form the past tense.
"Borrowed" is a regular verb. It follows the typical pattern for forming past tense verbs by adding '-ed' to the base form of the verb.
The word "blow" is an irregular verb. It does not follow the typical pattern of adding "-ed" to form its past tense ("blew" instead of "blowed") and past participle ("blown" instead of "blowed").
If everybody is irregular, does that mean we are all actually regular?
answer: maybe!
When used as a verb, the word heart is a regular verb.
The root word is regular, with the prefix "ir-" added.
It is irregular.
The only word that rhymes with regular is irregularirregular. jugular. popular.