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sinister: sinister: see left
Abyssinia (n.): old name for Ethiopia, 1630s, from Modern Latin Abyssinia, from Arabic Habasah, the name for the region, said to be from Amharic hbsh "mixed," in reference to the different races dwelling there. In 1920s-30s popular as a slang pun for "I'll be seeing you." Related: Abyssinian.
asinine (adj.): c. 1600, "obstinate, stupid," from Latin asininus "stupid," literally "like an ass," from asinus "ass," also "dolt, blockhead" (see ass (n.1)). The literal sense in English is recorded from 1620s.
Eleusinian (adj.): 1640s, "pertaining to Eleusis," town outside Athens, site of the mystery associated with the cult of Demeter, goddess of harvests, and her daughter.
Sinic (adj.): "Chinese," 1660s, from Medieval Latin Sinicus, from Sina "China," from Late Latin Sinae (plural) "the Chinese" (see Sino-).
sinical (adj.): "of or relating to sines," 1590s, from sine + -ical.
Sinicism (n.): "Chinese ways, Chinese affectations," 1891; see Sino- + -ism. Related: Sinicize; Sinification.
sinister (adj.): early 15c., "prompted by malice or ill-will, intending to mislead," from Old French senestre, sinistre "contrary, false; unfavorable; to the left" (14c.), from Latin sinister "left, on the left side" (opposite of dexter), of uncertain origin. Perhaps meaning properly "the slower or weaker hand" [Tucker], but Klein and Buck suggest it's a euphemism (see left (adj.)) connected with the root of Sanskrit saniyan "more useful, more advantageous." With contrastive or comparative suffix -ter, as in dexter (see dexterity).

The Latin word was used in augury in the sense of "unlucky, unfavorable" (omens, especially bird flights, seen on the left hand were regarded as portending misfortune), and thus sinister acquired a sense of "harmful, unfavorable, adverse." This was from Greek influence, reflecting the early Greek practice of facing north when observing omens. In genuine Roman auspices, the augurs faced south and left was favorable. Thus sinister also retained a secondary sense in Latin of "favorable, auspicious, fortunate, lucky."

Meaning "evil" is from late 15c. Used in heraldry from 1560s to indicate "left, to the left." Bend (not "bar") sinister in heraldry indicates illegitimacy and preserves the literal sense of "on or from the left side" (though in heraldry this is from the view of the bearer of the shield, not the observer of it).
sinistral (adj.): late 15c., "unlucky," from Old French senestral, sinistral or Medieval Latin *sinistralis, from sinister (see sinister). Meaning "on the left side" is from 1803. Related: Sinistrally.
sinistrorse (adj.): 1856, a word wanted by the botanists to describe the direction of spiral structures in nature, from Latin sinistrorsus "toward the left side," from sinister "left" (see sinister). It was paired with dextrorse but confusion over what was the proper point of view to reckon leftward or rightward spiraling prevented the word being as useful as it might have been.