Tongue-tied
Pronunciation : Tongue"-tied`
Part of Speech : a.
Definition : 1. Destitute of the power of distinct articulation; having an impediment in the speech, esp. when caused by a short fr?num.
2. Unable to speak freely, from whatever cause. Love, therefore, and tongue-tied simplicity. Shak.
Source : Webster's Unabridged Dictionary, 1913