One irresponsible person is one that can not be dependable.
If something was written in symbols and not in normal alphabet, it means that it is encoded.
To say that somethig is irrelevant is to consider that it is not related to the subject, it's not important and does not apply.
To be invincible is to be one that cannot be conquered.
Illaudable is the adjective used for someone or something that is not worthy of praise.
