Is being angry a sin? Generally, no, but more often than not, yes. Most of the verses about anger (by different Greek words) have to do with sin.
Jesus said in Matthew 5:
Ὀργίζεσθε (Orgizesthe)
Verb - Present Imperative Middle or Passive - 2nd Person Plural
Strong's 3710: To irritate, provoke, be angry. From orge; to provoke or enrage, i.e. become exasperated.
My paraphrase:
Within the context of a husband-wife relationship, I'd even minimize the instances of short-term righteous anger. Talk things out calmly. No need to resort to any form of anger. It is better to have a peace-filled home at all times.
Jesus said in Matthew 5:
Paul in Galatians 5:22 I say to you that everyone who is angry [G3710] with his brother will be liable to judgment; whoever insults his brother will be liable to the council; and whoever says, ‘You fool!’ will be liable to the hell of fire.
Colossians 3:19Now the works of the flesh are evident: sexual immorality, impurity, sensuality, 20idolatry, sorcery, enmity, strife, jealousy, fits of anger [G2372], rivalries, dissensions, divisions, 21envy, drunkenness, orgies, and things like these. I warn you, as I warned you before, that those who do such things will not inherit the kingdom of God.
James 1:8 But now you must put them all away: anger [G3709], wrath [2372], malice, slander, and obscene talk from your mouth.
There is an exception when anger is okay, Ephesians 4:20 for the anger [G3709] of man does not produce the righteousness of God.
Be angry,25Therefore, having put away falsehood, let each one of you speak the truth with his neighbor, for we are members one of another. 26 Be angry [G3710] and do not sin; do not let the sun go down on your anger [G3950],
Ὀργίζεσθε (Orgizesthe)
Verb - Present Imperative Middle or Passive - 2nd Person Plural
Strong's 3710: To irritate, provoke, be angry. From orge; to provoke or enrage, i.e. become exasperated.
My paraphrase:
However you describe the anger, Paul finished the paragraph with:Being irritated/provoked because of your righteous stance, be angry but do not sin.
Short-term righteous anger is okay. For the longer term, always be kind.31 Let all bitterness and wrath [G2372] and anger [G3709] and clamor and slander be put away from you, along with all malice. 32 Be kind to one another, tenderhearted, forgiving one another, as God in Christ forgave you.
Within the context of a husband-wife relationship, I'd even minimize the instances of short-term righteous anger. Talk things out calmly. No need to resort to any form of anger. It is better to have a peace-filled home at all times.