口说无凭

(idiom) you can't rely on a verbal agreement / just because sb says sth, doesn't mean it's true

(idiom) you can't rely on a verbal agreement; just because sb says sth, doesn't mean it's true

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls

to persuade

to speak / to say / to explain / to scold / to tell off / a theory (typically the last character in a compound, as in 日心說|日心说 heliocentric theory)

variant of 說|说[shuo1]

to speak; to talk; to say / to explain; to comment / to scold; to tell off / (bound form) theory; doctrine

not to have / no / none / not / to lack / un- / -less

variant of 憑|凭[ping2]

to lean against / to rely on / on the basis of / no matter (how, what etc) / proof