tranquil

As adjectives the difference between sprightly and tranquil

is that sprightly is animated, vivacious or gay; lively while tranquil is free from emotional or mental disturbance.

As an adverb sprightly

is in a lively and vigorous way.

As an adjective tranquil

is free from emotional or mental disturbance.

As a verb mollify is

to ease a burden, particularly worry; make less painful; to comfort.

As adjectives the difference between solemn and tranquil

is that solemn is deeply serious and somber while tranquil is free from emotional or mental disturbance.

As a noun peacefulness

is the state of being peaceful.

As an adjective tranquil is

free from emotional or mental disturbance.

As adjectives the difference between bored and tranquil

is that bored is suffering from boredom while tranquil is free from emotional or mental disturbance.

As a verb bored

is past tense of bore.

Easy is a synonym of tranquil.

As adjectives the difference between easy and tranquil

is that easy is comfortable; at ease while tranquil is free from emotional or mental disturbance.

As an adverb easy

is in a relaxed or casual manner.

As a noun easy

is something that is easy.

As a verb easy

is to easy-oar (stop rowing).

Tranquil is a related term of aloof.

As adjectives the difference between tranquil and aloof

is that tranquil is free from emotional or mental disturbance while aloof is reserved and remote; either physically or emotionally distant; standoffish.

As an adverb aloof is

at or from a distance, but within view, or at a small distance; apart; away.

As a preposition aloof is

(obsolete) away from; clear of.

Tranquil is a related term of assuasive.

As adjectives the difference between tranquil and assuasive

is that tranquil is free from emotional or mental disturbance while assuasive is mild, soothing.

As a noun assuasive is

anything that soothes.

As an adjective tranquil is

free from emotional or mental disturbance.

As adjectives the difference between splendid and tranquil

is that splendid is possessing or displaying splendor; shining; very bright; as, a splendid sun while tranquil is free from emotional or mental disturbance.