Colloquial is a see also of informal.
As adjectives the difference between informal and colloquial
is that informal
is not formal or ceremonious; casual while colloquial
is (linguistics) denoting a manner of speaking or writing that is characteristic of familiar conversation; informal.
Not formal or ceremonious.
The Mirror and the Lamp
, passage=One saint's day in mid-term a certain newly appointed suffragan-bishop came to the school chapel, and there preached on “The Inner Life.” He at once secured attention by his informal
method, and when presently the coughing of Jarvis […] interrupted the sermon, he altogether captivated his audience with a remark about cough lozenges being cheap and easily procurable.}}
Not in accord with the usual regulations.
Suited for everyday use.
(of language) Reflecting everyday, non-ceremonious usage.
(gardening) Not organized; not structured or planned.
* (not formal or ceremonious) casual
* (not in accord with the usual regulations) unofficial
* (suited for everyday use) casual
(linguistics) Denoting a manner of speaking or writing that is characteristic of familiar conversation; informal.
Of or pertaining to a conversation; conversational or chatty.
Note that while colloquy and colloquium refer to formal'' conversation, colloquial refers instead specifically to ''informal conversation.