(physics, philosophy) An attempt to solve a problem using the power of human imagination.

Marked by or showing lack of due thought or care; careless. / Inconsiderate, inattentive. / Lacking thought or consideration.

In a thoughtful or pensive manner. / In a way that shows kindness or consideration for others.

Demonstrating thought or careful consideration. / Demonstrating kindness or consideration for others.

plural of thought

Thoughtful and considerate attention. / Careful deliberation before action.

disregard for other's feelings / heedless disregard for the consequences of one's actions

(UK) Alternative form of on second thought

(idiomatic) To remain in one's mind for a long duration.

A group that aims to control what other people think.