What does massless mean?
Massless means Having no mass..
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/ˈmæs.ləs/ · adjective
Having no mass..
The photon is a massless particle.
On the other hand, Pauli had just proposed a massless, chargeless, colorless, flavorless particle whose sole reason for existence was to preserve the principle of momentum conservation.
Use massless when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Massless means Having no mass..
The closest synonym depends on the sentence and intended sense.
Possible antonyms include massive.
The photon is a massless particle.
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