extenuate (v.) Look up extenuate at Dictionary.com
1520s, from Latin extenuatus, past participle of extenuare "lessen, make small, reduce, diminish," from ex- "out" (see ex-) + tenuare "make thin," from tenuis "thin" (see tenet). Related: Extenuated; extenuating. Extenuating circumstances attested from 1660s.