Unplanned

noun
1.
a scheme or method of acting, doing, proceeding, making, etc., developed in advance:
battle plans.
2.
a design or scheme of arrangement:
an elaborate plan for seating guests.
3.
a specific project or definite purpose:
plans for the future.
4.
Also called plan view. a drawing made to scale to represent the top view or a horizontal section of a structure or a machine, as a floor layout of a building.
5.
a representation of a thing drawn on a plane, as a map or diagram:
a plan of the dock area.
6.
(in perspective drawing) one of several planes in front of a represented object, and perpendicular to the line between the object and the eye.
7.
a formal program for specified benefits, needs, etc.:
a pension plan.
verb (used with object), planned, planning.
8.
to arrange a method or scheme beforehand for (any work, enterprise, or proceeding):
to plan a new recreation center.
9.
to make plans for:
to plan one’s vacation.
10.
to draw or make a diagram or layout of, as a building.
verb (used without object), planned, planning.
11.
to make plans:
to plan ahead; to plan for one’s retirement.
adjective
1.
not planned: an unplanned baby
noun
1.
a detailed scheme, method, etc, for attaining an objective
2.
(sometimes pl) a proposed, usually tentative idea for doing something
3.
a drawing to scale of a horizontal section through a building taken at a given level; a view from above an object or an area in orthographic projection Compare ground plan (sense 1), elevation (sense 5)
4.
an outline, sketch, etc
5.
(in perspective drawing) any of several imaginary planes perpendicular to the line of vision and between the eye and object depicted
verb plans, planning, planned
6.
to form a plan (for) or make plans (for)
7.
(transitive) to make a plan of (a building)
8.
(transitive; takes a clause as object or an infinitive) to have in mind as a purpose; intend
In addition to the idiom beginning with plan