placid

As adjectives the difference between placid and mellow

is that placid is serene; calm while mellow is soft or tender by reason of ripeness; having a tender pulp.

As a noun mellow is

a relaxed mood.

As a verb mellow is

to make mellow; to relax or soften.

As adjectives the difference between placid and relaxed

is that placid is serene; calm while relaxed is having an easy-going mood or temperament.

As a verb relaxed is

(relax).

As adjectives the difference between placid and passive

is that placid is calm and quiet; peaceful; tranquil while passive is being subjected to an action without producing a reaction.

As a noun passive is

the passive voice of verbs.

As adjectives the difference between wary and placid

is that wary is cautious of danger; carefully watching and guarding against deception, artifices, and dangers; timorously or suspiciously prudent; circumspect; scrupulous; careful while placid is serene; calm.

As adjectives the difference between placid and livid

is that placid is serene; calm while livid is livid.

Unmolested is a related term of placid.

As adjectives the difference between unmolested and placid

is that unmolested is not molested while placid is serene; calm.

Placid is a related term of dovelike.

As adjectives the difference between placid and dovelike

is that placid is serene; calm while dovelike is similar to a dove.

As an adverb dovelike is

in a manner similar to a dove; as, to "dovelike, sit brooding on the vast abyss" (milton).

Motionless is a related term of placid.

As adjectives the difference between motionless and placid

is that motionless is at rest, stationary, immobile, not moving while placid is serene; calm.

As adjectives the difference between pallid and placid

is that pallid is appearing weak, pale or wan while placid is serene; calm.

As adjectives the difference between placid and unperturbed

is that placid is serene; calm while unperturbed is not perturbed.