(US, idiomatic) After reconsidering; on further consideration.

(idiomatic) To change one's opinion, or be uneasy about a previous decision.

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.

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

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

(countable) Representation created in the mind without the use of one's faculties of sight, sound, smell, touch, or taste; an instance of thinking.

simple past tense and past participle of think

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

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