The word 'undiscriminating' is built upon the core concept of 'discrimination,' which originates from the Latin discriminare, meaning to separate or distinguish. This verb itself comes from discrimen, meaning a dividing line or distinction, rooted in the verb discernere (to separate, distinguish). The addition of the negative prefix 'un-' directly reverses the meaning, creating a sense of "not distinguishing." The '-ing' suffix then forms an adjective describing a person or action that lacks the ability or willingness to make careful distinctions, thus leading to its modern meaning of being uncritical or accepting without judgment.

Structure: un (not) + discriminat (distinguish) + ing (adjective suffix) - un: A prefix of Germanic origin (Old English) meaning "not," used to form negatives. - discriminat: A root derived from the Latin verb discriminare, meaning "to divide, separate, or distinguish." - ing: A suffix of Germanic origin (Old English) used to form present participles and adjectives from verbs.