She sat with a pensive, faraway look on her pretty face, absorbed with thoughts of their last night together.
The detective stood staring at the opaque window, looking pensive.
As the sun set over the ocean, Emily sat on the beach, lost in pensive thoughts about her future.
I can see why the word thoughtless might seem to be an antonym for pensive, since a pensive person thinks a lot and a thoughtless person doesn't, however, thoughtlessness is really about irresponsibility, it is not really about thought in general. The opposite of thoughtless is thoughtful or responsible, not pensive. The opposite of pensive would be spontaneous, or glib.
Thoughtful, reflective, contemplative.
The root would likely be "pense," which means to pay over or give someone or something its fair value, as in the English words, compensate - to pay what is justly due, and recompense - to repay for harm done. Further, we see it slightly changed in the British "Pence," a monetary unit, which is, of course, used to pay for things. So pensive, meaning now deep in thought, would have had basically the same meaning at its origin as it does now, just phrased differently - to pay full attention to some matter, in this case with one's mind.
Pensive maens deep in thought. Edwad is pensive when he reads people's minds.
We admired the skill with which the artist captured the child's pensive expression.
His forehead pursed in pensive thought, the young man contemplated life.
he was sitting on the sofa in a pensive way, he couldn't stop thinking of her not being here any more
The detective stood staring at the opaque window, looking pensive.
The boy was very pensive and philosophical.
pensive = gânditor
"He was pensive most days, scornful others." Pensive means dreamily or wistfully thoughtful.
As the sun set over the ocean, Emily sat on the beach, lost in pensive thoughts about her future.
Many people are pensive during tests. His essay when read made you pensive.
He glanced from time to time at her sad and pensive face.
Pensive.