Chato, monótono.
a.Uttered in one unvarying tone; continued with dull uniformity; characterized by monotony; without change or variety; wearisome.
adj.humdrum, dull similar term adj, flat, monotone, monotonic, unmodulated similar term
Vogais: oooou
Consoantes: mntns
monotone, monotony, monton, monodon, moton, monition, motion, motown, mouton, montana.