Blank Verse - unrhymed lines written in iambic pentameter.
Excerpt from Macbeth by William Shakespeare
Tomorrow, and tomorrow, and tomorrow,
Creeps in this petty pace from day to day, To the last syllable of recorded time;
And all our yesterdays have lighted fools
The way to dusty dea. Out, out brief candle!
Life's but a walking shadow, a poor player
That struts and frets his hour upon the stage
And then is heard no more: it is a tale
Told by an idiot, full of sound and fury,
Signifying nothing.