Intensify
Part of speech: verb
Definition: To render more intense; as, to intensify heat or cold; to intensify colors; to intensify a photographic negative; to intensify animosity. To become intense, or more intense; to act with increasing power or energy.
Deepen
Part of speech: verb
Definition: To make deep or deeper; to increase the depth of; to sink lower; as, to deepen a well or a channel.To make darker or more intense; to darken; as, the event deepened the prevailing gloom.To make more poignant or affecting; to increase in degree; as, to deepen grief or sorrow.To make more grave or low in tone; as, to deepen the tones of an organ.To become deeper; as, the water deepens at every cast of the lead; the plot deepens.
Example sentence: Growing up I was told, 'Stop acting like a girl. Don't stand like that, don't act like that, deepen your voice.' But for me, it came naturally.