Palmary

Foremost among achievements and especially deserving of admiration.

Reach for it when singling out the finest or most notable success in a record

The architect's palmary work transformed an abandoned depot into a civic hall.

• warm

  finest

  for the best example within a named set

  not when Finest makes a direct ranking that requires a defensible comparison.

• professional

  outstanding

  when exceptional quality can be praised in familiar language

  not when Several things may be outstanding, so the word makes no single foremost choice.

• formal

  preeminent

  for recognized superiority within a field

  not when Preeminent usually describes a person or standing, not one achievement.

• formal

  signal

  when one success is conspicuously notable among others

  not when Many readers know signal chiefly as a noun, making this adjective easy to misread.

• literary

  crowning

  if an achievement completes and surpasses a body of work

  not when Crowning implies culmination, which may be wrong early in a career.

• minor
• mediocre
• ignoble

• palmary achievement

  Her palmary achievement was opening the collection to every local school.

• palmary example

  The bridge remains a palmary example of early steelwork.

• palmary virtue

  Patience was his palmary virtue during the difficult negotiations.