1. [adj]  not critical; not tending to find or call attention to errors; "a devoted and almost uncritical admirer"
2. [adj]  marked by disregard for critical standards or procedures; "news sources reflected uncritical estimates of the number of juvenile addicts"
3. [adj]  lacking in discrimination; "she was absolutely uncritical, she believed everything"

UNCRITICAL is a 10 letter word that starts with U.