English: dysfluency
Welsh: diffyg rhuglder
Subject: Addysg
Welsh definition: Speech that exhibits deviations in continuity, fluidity, ease of rate and effort, with hesitations or repetition of sounds, words, or phrases; lack of skillfulness in speech. 
Welsh context: Atal dweud (a elwir hefyd yn siarad ag atal neu ddiffyg rhuglder) – lleferydd a nodweddir gan lawer o ailadrodd neu estyn synau, sillafau neu eiriau, neu gan lawer o betruso neu oedi sy'n tarfu ar lif rhythmig y lleferydd.