Himself-Hisself | Commonly Confused Words

Hisself

A nonstandard form used for 'himself' referring to the same person (male) who is the object of a verb or preposition and is the same as the subject.

/ɪm'self/

Used to refer to a man, boy, or male animal when the subject and object of the verb are the same person or animal

He was beside himself.Sikes himself is sure to show up soon!"And he had been thrilled in spite of himself.

This word has no antonyms

Himself is the standard form for the reflexive pronoun for he.
Hisself is considered nonstandard or dialectal, used in some vernacular English.
Remember, standard English in writing and formal speech requires himself.
You might encounter hisself in casual speech or in literature to depict regional dialects.
Think of himself as the one you would choose for formal settings.