Different colours have very different meaning, and even different shades of a colour may mean totally different thing.
RED. Physical
Positive: Physical courage, strength, warmth, energy, basic survival, ‘fight or flight’, stimulation, masculinity, excitement.
Negative: Defiance, aggression, visual impact, strain.
BLUE. Intellectual.
Positive: Intelligence, communication, trust, efficiency, serenity, duty, logic, coolness, reflection, calm.
Negative: Coldness, aloofness, lack of emotion, unfriendliness.
YELLOW. Emotional
Positive: Optimism, confidence, self-esteem, extraversion, emotional strength, friendliness, creativity.
Negative: Irrationality, fear, emotional fragility, depression, anxiety, suicide.
GREEN. Balance
Positive: Harmony, balance, refreshment, universal love, rest, restoration, reassurance, environmental awareness, equilibrium, peace.
Negative: Boredom, stagnation, blandness, enervation.
VIOLET. Spiritual
Positive: Spiritual awareness, containment, vision, luxury, authenticity, truth, quality.
Negative: Introversion, decadence, suppression, inferiority.
ORANGE.
Positive: Physical comfort, food, warmth, security, sensuality, passion, abundance, fun.
Negative: Deprivation, frustration, frivolity, immaturity.
PINK.
Positive: Physical tranquillity, nurture, warmth, femininity, love, sexuality, survival of the species.
Negative: Inhibition, emotional claustrophobia, emasculation, physical weakness.
GREY.
Positive: Psychological neutrality.
Negative: Lack of confidence, dampness, depression, hibernation, lack of energy.
BLACK.
Positive: Sophistication, glamour, security, emotional safety, efficiency, substance.
Negative: Oppression, coldness, menace, heaviness.
WHITE.
Positive: Hygiene, sterility, clarity, purity, cleanness, simplicity, sophistication, efficiency.
Negative: Sterility, coldness, barriers, unfriendliness, elitism.
BROWN.
Positive: Seriousness, warmth, Nature, earthiness, reliability, support.
Negative: Lack of humour, heaviness, lack of sophistication.
Credit:
Psychological Properties Of Colours
http://www.colour-affects.co.uk/psychological-properties-of-colours