Some words that rhyme with "pensive" are extensive, offensive, and defensive.
Replacing the "w" with a "p" will give you a rhyming word. I'd write it out, but this website has something against little kitty cats.
crusty, dusty.musty,lusty, blustery
Bondly
Godly
Oddly
Calmly
nonchalantly
Gravy, navy,
tensive , expensive,sensive.
dishes
fishes
Fistfull
Extensive, Pensive, Hypertensive, Defensive
pensive = gânditor
She was pensive in her thoughts
"He was pensive most days, scornful others." Pensive means dreamily or wistfully thoughtful.
Many people are pensive during tests. His essay when read made you pensive.
Superlative of remote: remotest; comparative of remote: more remote. Superlative of painful: most painful; comparative of painful: more painful. Superlative of pensive: most pensive; comparative of pensive: more pensive.
Pensive maens deep in thought. Edwad is pensive when he reads people's minds.
he was sitting on the sofa in a pensive way, he couldn't stop thinking of her not being here any more
He glanced from time to time at her sad and pensive face.
We admired the skill with which the artist captured the child's pensive expression.
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.
The detective stood staring at the opaque window, looking pensive.