Goodly

Considerable, attractive, or admirable in amount or quality.

Reach for it when using an old-fashioned word for a pleasingly substantial quantity

The orchard produced a goodly supply of plums.

• playful

  quite a haul

  informal speech celebrates a large collection or yield

  not when The phrase fits gathered goods and not abstract merit or beauty.

• everyday

  sizeable

  plain language should mark notable extent

  not when Sizeable is descriptive and says nothing about quality.

• warm

  ample

  there is comfortably enough for the purpose

  not when Ample concerns sufficiency, while goodly may simply mean large.

• professional

  substantial

  amount or importance is measurably significant

  not when Substantial is neutral and lacks goodly's approving traditional flavor.

• formal

  considerable

  the quantity deserves notice without exact measurement

  not when Considerable does not itself say the amount is welcome.

• literary

  handsome

  an amount is pleasingly generous or appearance is well proportioned

  not when Handsome is idiomatic only with certain nouns and can sound dated.

• meager
• paltry
• small

• goodly number

  A goodly number of residents attended despite the rain.

• goodly sum

  The concert raised a goodly sum for roof repairs.

• goodly supply

  A goodly supply of apples remained for the community kitchen.

Goodly is old-fashioned and sometimes ambiguous between attractive and large. Substantial or ample is usually clearer.