Assia
Very
Ex. Allegro assia = very fast
Con
With
Ex. Con fuoco = with fire
Molto
Much
Ex. Molto crescendo = increase volume significantly
Non troppo
Not too much
Ex. Allegro non troppo = not too fast
Poco a poco
Little by little
Ex. Diminuendo poco a poco = softer little by little
Subito
Immediately, suddenly
Ex. Subito piano = suddenly soft
Senza
Without
Ex. Senza sordino = without mute
Sempre
Always
Ex. Sempre staccato = always separated
Simile
Continue in a like manner (usually used for articulation)