late 14c., from Old French indirect (14c.) or directly from Late Latin indirectus "not direct," from in- "not, opposite of" (see in- (1)) + directus (see direct (adj.)). Related: Indirectness.
Entries linking to indirect
in- 1
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.
direct adj.
c. 1400, "straight, undeviating, not crooked," from Old French direct (13c.) and directly from Latin directus "straight," adjectival use of past participle of dirigere "to set straight," from dis- "apart" (see dis-) + regere "to direct, to guide, keep straight" (from PIE root *reg- "move in a straight line"). Meaning "plain, expressive, not ambiguous" is from 1580s.