dign-, dain-

(Latin: worthy; to deem worthy or fit)

indignation
indignity
infra dignitatem; infra dig.
Beneath the dignity [of someone].

Undignified. The phrase is used to indicate that a suggested or contemplated act does not befit one's character or standing. Some people shorten the phrase to infra dig by those who know.

Integrias, veritas, dignitas.
Integrity, truth, dignity.

Motto of Indiana Northern Graduate School of Professional Management, USA.

Nomine digna.
May it be worthy of the name.

Motto of the former African country of Rhodesia.

Testibus deponentibus in pari numero, dignioribus est credendum
"Where the witnesses who testify are in equal number (on both sides), the more worthy are to be believed."