This poem comes from the Silva distichorum moralium by François Oudin (1719).
Promissor Futilis
Futilis est, qui multa solet promittere; magnus
Denique promissor dat, nisi verba, nihil.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
fūtilis, -e (fūtilis): worthless, vain
prōmissor (prōmissōris, m.): promiser, guarantor
dēnique: finally
dō dare dedī datum: give
māgnus -a -um great
multus -a -um: much, many; multō, by far
nihil, nīl: nothing; not at all
nisi/nī: if not, unless
prōmittō -mittere -mīsī -missum: send forth, offer
qui quae quod: who, which, what / quis quid: who? what? which?
soleō -ēre -uī -itum: be accustomed
sum, esse, fuī: be, exist
verbum -ī n.: word