quietude

As a noun quietude

is tranquility.

As an adjective undefined is

lacking a definition or value.

Quietude is a related term of composure.

As nouns the difference between quietude and composure

is that quietude is tranquility while composure is calmness of mind or matter, self-possession.

Quietude is a related term of sedateness.

As nouns the difference between quietude and sedateness

is that quietude is tranquility while sedateness is the state or quality of being sedate; calmness of mind, manner, or countenance; composure; placidity; serenity; tranquillity.

As a noun quietude

is tranquility.

As an adjective undisturbed is

not disturbed or agitated.

As an adjective tranquil

is free from emotional or mental disturbance.

As a noun quietude is

tranquillity.

Quietude is a related term of ease.

As nouns the difference between quietude and ease

is that quietude is tranquility while ease is the state of being comfortable or free from stress.

As a verb ease is

to free (something) from pain, worry, agitation, etc.

As nouns the difference between quietude and loneliness

is that quietude is tranquility while loneliness is a feeling of depression resulting from being alone.

Inquietude is a antonym of quietude.

As nouns the difference between quietude and inquietude

is that quietude is tranquillity while inquietude is a condition of being restless, uneasy or nervous.

As nouns the difference between quietude and solitude

is that quietude is tranquility while solitude is aloneness; state of being alone or solitary, by oneself.

Quietude is a related term of stillness.

As nouns the difference between quietude and stillness

is that quietude is tranquility while stillness is the quality or state of being still; quietness; silence; calmness; inactivity.