different between airless vs airlessly

English

air +? -less

airless (comparative more airless, superlative most airless)

Lacking or being without air.
Lacking air circulation.
With air that is stale.
(medicine) Suffering from asphyxia.
(figuratively) Stifling; dead; lacking vitality or excitement.
- The worst that can—and has—been said about Memento is that it’s an airless gimmick, visually undistinguished, and not even all that sophisticated when the puzzle pieces are finally put together.

airless +? -ly

airlessly (comparative more airlessly, superlative most airlessly)

In a airless manner; without air.
The balloon crashed airlessly to the ground.

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