Emily Dickinson Lexicon

IN-COM-PAT'I-BLE, a. [Fr. from the L. in and competo, to suit, to be proper or convenient; con and peto, to press toward, to seek, or press on. It was formerly incompetible.]

1. Inconsistent; that can not subsist with something else. Thus, truth and falsehood are essentially incompatible, as are virtue and vice. A degree of cold that congeals water is incompatible with vegetation. Dissipation is incompatible with health, reputation and virtue.
2. Irreconcilably different or disagreeing; incongruous; as, incompatible tempers.
3. Legally or constitutionally inconsistent; that can not be united in the same person, without violating the law or constitution. By our constitution, the offices of a legislator and of a judge are incompatible, as they can not be held at the same time by the same person.