Bug-free

Operating without any known software defects.

Reach for it when describing a tested release while avoiding a guarantee about undiscovered defects

The team shipped a bug-free build under the agreed test suite.

• playful

  clean

  informal engineering shorthand means no observed issues

  not when Clean could mean code style, security, or build output instead.

• everyday

  working as intended

  plain language ties success to expected behavior

  not when The intended behavior itself may be incomplete or wrong.

• professional

  defect-free

  testing found no failures against defined requirements

  not when Defect-free is still an absolute claim and depends on test scope.

• professional

  error-free

  output contains no detected mistakes

  not when Error-free can refer to data or human work rather than software behavior.

• professional

  stable

  the system runs reliably without frequent crashes or regressions

  not when Stable software can still contain many functional bugs.

• buggy
• defective
• unstable

• bug-free release

  The bug-free release passed the published regression suite.

• bug-free code

  Bug-free code remains a claim about what testing has found so far.

• apparently bug-free

  The feature is apparently bug-free under the supported browsers.

Bug-free is an absolute claim that testing cannot prove for nontrivial software. Name the tested scope and say no known bugs when that is the verified fact.