<p><strong>Adjective:</strong></p><ul><li>threatening or portending evil, harm, or trouble; ominous: a sinister remark.</li><li>bad, evil, base, or wicked; fell: his sinister purposes.</li><li>unfortunate; disastrous; unfavorable: a sinister accident.</li><li>of or on the left side; left.</li><li>Heraldry: noting the side of an escutcheon or achievement of arms that is to the left of the bearer (dexter).</li></ul>