Walang batayan (en. Without basis)

/wa.laŋ ba.ta.jan/

Synonyms

No strong basis or reason.

Wow, it seems like your reason for leaving has no basis at all!

Grabe, parang walangbatayan yung sinabi mong dahilan sa pag-alis mo!

Unbelievable or fake news.

Don't believe the rumors; they're all just baseless.

Huwag kang papaniwala sa mga chismis, puro walangbatayan lang 'yan.

No truth or substance.

What he's saying is baseless, so I ignored him.

Ang sinasabi niya ay walangbatayan, kaya hindi ko siya pinansin.