endulzar - to sweeten
endurecer - to harden
enfatizar - to emphasize
enflaquecer - to make thin, to weaken, to get thin
engreir - to spoil, to spoil oneself, to show off
engrosar - to thicken
engullir - to devour
enhebrar - to thread
enloquecer - to drive crazy
enmohecer - to rust
ennoblecer - to ennoble
enrarecer - to rarefy
enredar - to entangle, to involve, to confuse