indelicate (adj.)

word-forming element meaning "not, opposite of, without" (also im-, il-, ir- by assimilation of -n- with following consonant, a tendency which began in later Latin), from Latin in- "not," cognate with Greek an-, Old English un-, all from PIE root *ne- "not."

In Old French and Middle English often en-, but most of these forms have not survived in Modern English, and the few that do (enemy, for instance) no longer are felt as negative. The rule of thumb in English has been to use in- with obviously Latin elements, un- with native or nativized ones.

late 14c., of persons, "self-indulgent, loving ease;" also "sensitive, easily hurt, feeble;" of things, "delightful," from Latin delicatus "alluring, delightful, dainty," also "addicted to pleasure, luxurious, effeminate," in Medieval Latin "fine, slender;" related to deliciae "pleasure, delight, luxury," and delicere "to allure, entice," from de "away" (see de-) + lacere "to lure, entice," which is of uncertain origin. Compare delicious, delectable, delight.

Meaning "so fine or tender as to be easily broken" is recorded from 1560s. Meaning "requiring nice and skillful handling" is by 1742. Sense of "exquisitely adjusted in construction" is from 1756. Related: Delicateness.

1712, from indelicate + abstract noun suffix -cy.