Informal vs. Unofficial

Informaladjective

Not formal or ceremonious.

‘an informal get-together’;

Unofficialadjective

Not officially established.

‘the unofficial results of the ballot’;

Informaladjective

Not in accord with the usual regulations.

‘an informal agreement’;

Unofficialadjective

Implicitly true but withheld and/or contradicted by authority.

‘The unofficial reason for invading the nation, however, was to control their resources.’;

Informaladjective

Suited for everyday use.

‘informal clothes’;

Unofficialadjective

Not acting with official authority.

‘an unofficial adviser’;

Informaladjective

(of language) Reflecting everyday, non-ceremonious usage.

Unofficialadjective

(pharmacology) Not listed in a national pharmacopeia etc.

Informaladjective

(gardening) Not organized; not structured or planned.

Unofficialadjective

not having official authority or sanction;

‘a sort of unofficial mayor’; ‘an unofficial estimate’; ‘he participated in an unofficial capacity’;

Informaladjective

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 writing, proceeding, or visit.

Unofficialadjective

not officially established;

‘the early election returns are unofficial’;

Informaladjective

Deranged in mind; out of one's senses.

‘These poor informal women.’;

Informaladjective

not formal;

‘conservative people unaccustomed to informal dress’; ‘an informal free-and-easy manner’; ‘an informal gathering of friends’;

Informaladjective

not officially recognized or controlled;

‘an informal agreement’; ‘a loose organization of the local farmers’;

Informaladjective

used of spoken and written language

Informaladjective

having or fostering a warm or friendly atmosphere; especially through smallness and informality;

‘had a cozy chat’; ‘a relaxed informal manner’; ‘an intimate cocktail lounge’; ‘the small room was cozy and intimate’;