Informal/(অনানুষ্ঠানিক)

Not in the regular, usual, or established form; not according to official, conventional, prescribed, or customary forms or rules; irregular; hence, without ceremony; as, an informal writting, proceeding, or visit. Deranged in mind; out of one's senses.

Synonyms

Colloquial casual unofficial casual

Antonyms

Formal

Adjective

Not formal or ceremonious. Not in accord with the usual regulations. Suited for everyday use. (of language) Reflecting everyday, non-ceremonious usage. Not organized; not structured or planned.