Underdeveloped is a related term of troubled.

As adjectives the difference between underdeveloped and troubled

is that underdeveloped is immature and not fully developed while troubled is anxious, worried, careworn.

As verbs the difference between underdeveloped and troubled

is that underdeveloped is (underdevelop) while troubled is (trouble).

Stern is a related term of ascetic.

As nouns the difference between stern and ascetic

is that stern is a star; a small luminous dot that can be seen on the night sky while ascetic is one who is devoted to the practice of self-denial, either through seclusion or stringent abstinence.

As an adjective ascetic is

of or relating to ascetics; characterized by rigorous self-denial or self-discipline; austere; abstinent; involving a withholding of physical pleasure.

As nouns the difference between acquaintance and cobber

is that acquaintance is a state of being acquainted, or of having intimate, or more than slight or superficial, knowledge; personal knowledge gained by intercourse short of that of friendship or intimacy while cobber is a pal, buddy, mate, friend; often used in direct address by one male to another.

Push is a related term of action.

In military|lang=en terms the difference between push and action

is that push is (military) a marching or drill maneuver/manoeuvre performed by moving a formation (especially a company front) forward or toward the audience, usually to accompany a dramatic climax or crescendo in the music while action is (military) combat.

As verbs the difference between push and action

is that push is (intransitive) to apply a force to (an object) such that it moves away from the person or thing applying the force while action is (management) to act on a request etc, in order to put it into effect.

As nouns the difference between push and action

is that push is a short, directed application of force; an act of pushing or push can be (obsolete|uk|dialect) a pustule; a pimple while action is something done so as to accomplish a purpose.

As an interjection action is

demanding or signifying the start of something, usually an act or scene of a theatric performance.

Sparse is a related term of thin.

As an adjective sparse

is having widely spaced intervals.

As a verb sparse

is (obsolete) to scatter; to disperse.

As a proper noun thin is

the fifth earthly branch represented by the.

Warm is a related term of benevolent.

As a verb warm

is .

As an adjective benevolent is

having a disposition to do good.

As verbs the difference between sire and fertilise

is that sire is of a male: to procreate; to father, beget while fertilise is standard spelling of from=non-Oxford British spelling|fertilize|lang=en.

As a noun sire

is a lord, master, or other person in authority, most commonly used vocatively: formerly in speaking to elders and superiors, later only when addressing a sovereign.

Drastic is a related term of precipitate.

As adjectives the difference between drastic and precipitate

is that drastic is extreme; severe while precipitate is headlong; falling steeply or vertically.

As a verb precipitate is

to make something happen suddenly and quickly; hasten.

As a noun precipitate is

a product resulting from a process, event, or course of action.

Passionless is a related term of stiff.

As adjectives the difference between passionless and stiff

is that passionless is lacking in passion while stiff is of an object, rigid, hard to bend, inflexible.

As a noun stiff is

an average person, usually male, of no particular distinction, skill, or education, often a working stiff''''' or ''lucky '''stiff .

As a verb stiff is

to fail to pay that which one owes (implicitly or explicitly) to another, especially by departing hastily.

Stymie is a related term of derail.

As nouns the difference between stymie and derail

is that stymie is an obstacle or obstruction while derail is a device placed on railway tracks causing a train to derail.

As verbs the difference between stymie and derail

is that stymie is to thwart or stump; to cause to fail or to leave hopelessly puzzled, confused, or stuck while derail is to cause to come off the tracks.