Synonyms and related words :
Spartan, austere, casual, common, degage, inaccurate, inexact, informal, inornate, low-pressure, relaxed, severe, stark, unconscientious, unconstrained, uncritical, unelaborate, unexacting, unfancy, unfinical, unmeticulous, unornate, unpainstaking, unparticular, unprecise, unpunctilious, unpunctual, unreserved, unrigorous, unscrupulous