unfussy (?.)

• 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