The difference between Quiescent and Tranquil

When used as adjectives, quiescent means inactive, quiet, at rest, whereas tranquil means free from emotional or mental disturbance.

check bellow for the other definitions of Quiescent and Tranquil

Quiescent as an adjective:

Inactive, quiet, at rest.

Examples:

"The bats were quiescent at that time of day, so we slowly entered the cave."
Quiescent as an adjective (orthography):

Not sounded; silent.

Examples:

"The k is quiescent in "knight" and "know"."
Quiescent as an adjective (cell biology):

Non-proliferating.