pass-, pati- +

1. Having sorrow or consideration for the sufferings or troubles of another or others, accompanied by an urge to help; deep sympathy or pity.
2. Suffering together with another, participation in suffering; fellow-feeling, sympathy.
3. The feeling or emotion, when a person is moved by the suffering or distress of another, and by the desire to relieve.

1. Feeling or showing compassion; sympathetic, kindhearted, pitying.
2. Affected with, characterized by, or expressing compassion; pitiful, sympathetic.

In a compassionate manner.

Having no sympathy or pity; without compassion.

Feeling or showing compassion; sympathetic, compassionate, pitiful.

A condition of suffering, or of being affected, together with another.

Mutual tolerance; consistency, congruity, rapport, like-mindedness.

1. Getting along well together; in agreement or harmony; rapport.
2. Mutually tolerant; capable of being admitted together, or of existing together in the same subject; accordant, consistent, congruous, agreeable.

Compatibility; consistency; fitness; agreement.

With compatibility; fitly; suitably; consistently.

A passion opposed to or the opposite of another.

Absence of passion, bias, or emotion; condition of coolness toward someone or something; apathy.

1. Free from passion, emotions, or bias.
2. Not influenced by strong feeling; especially, not affected by personal or emotional involvement.
3. Calm, composed; impartial; unemotional.

In an impartially dispassionate manner: "Although he was looking at the other woman, he did it dispassionately."

"He spoke dispassionately about the accident he just had."

1. Incompatibility in which one person's tissue cannot be transplanted to another person.
2. The rejection of tissue grafts by the host's immune system because the donor of the tissue has histocompatibility antigens that are too genetically dissimilar to the host's antigens.

The chances of histoincompatibility increase the more dissimilar the host and donor are from each other.