pensive

As an adjective pensive is

having the appearance of deep, often melancholic, thinking.

As adjectives the difference between pensive and boisterous

is that pensive is having the appearance of deep, often melancholic, thinking while boisterous is full of energy; exuberant; noisy.

As adjectives the difference between melancholy and pensive

is that melancholy is affected with great sadness or depression while pensive is having the appearance of deep, often melancholic, thinking.

As a noun melancholy

is black bile, formerly thought to be one of the four "cardinal humours" of animal bodies.

As a noun thinker

is one who spends time thinking, contemplating or meditating.

As an adjective pensive is

having the appearance of deep, often melancholic, thinking.

As an adjective pensive

is having the appearance of deep, often melancholic, thinking.

As a noun meditation is

a devotional exercise of, or leading to contemplation.

As adjectives the difference between pensive and speculative

is that pensive is having the appearance of deep, often melancholic, thinking while speculative is characterized by speculation; based on guessing or unfounded opinions.

As adjectives the difference between pensive and talkative

is that pensive is having the appearance of deep, often melancholic, thinking while talkative is tending to talk a lot.

As adjectives the difference between pensive and depressed

is that pensive is having the appearance of deep, often melancholic, thinking while depressed is unhappy, and blaming oneself rather than others; despondent.

As a verb depressed is

(depress).