Thalassian is the primary language of blood elves and high elves. It has both written and spoken equivalents. Individuals who are unfamiliar with the language's proper name may refer to it as High Elven.
Like Nazja, Thalassian is derived from the Darnassian language. Hence, Thalassian is closely related to Darnassian, and there is some overlap between the two languages. Further Darnassian utterances may therefore have been preserved in modern Thalassian, in addition to those that are specified below.
So far, linguistic scholars have opted to err on the side of caution in documenting Darnassian terms and phrases that are also considered part of the Thalassian language. Certainly this issue, however delicate, merits further research. Nevertheless, addressing a high elf or blood elf with a Darnassian-specific word or phrase can be considered offensive or at the very least rather foolish, and so the speaker must handle the situation with care.
Thalassian
Translation
Usage and Context
Al diel shala.
Safe travels.
A farewell.
Anar'alah belore.
By the light of the sun.
Used as either a battle cry or a vow.
Anaria shola.
Speak your business.
A greeting often used in a businesslike context.
Anu belore dela'na.
The sun guides us.
A greeting exchanged only with blood elves or high elves. Note that greeting a night elf with this phrase would not be particularly wise.
Bal'a dash, malanore.
Greetings, traveler.
A greeting.
Bash'a no falor talah!
Taste the chill of true death!
Not a widespread expression or battle cry. It seems reasonably clear, however, that the speaker is directing this threat against a group of undead.
Doral ana'diel?
How fare you?
A greeting.
medivh
keeper of secrets
When used as a proper noun, Medivh refers to the last Guardian of Tirisfal.
Selama ashal'anore.
Justice for our people.
Used as either a vow or a farewell.
Shindu fallah na!
They're breaking through!
No meaning beyond the obvious: a warning that the enemy has breached the defenses.
Shorel'aran.
Farewell.
A farewell.
sin'dorei
children of the blood
Can also be interpreted as "people of the bloodline". Typically used to refer to blood elves.
Sinu a'manore.
Well met.
A greeting.
sunstrider
he who walks the day
When used as a proper noun, Sunstrider is the family name of the high elves' royal bloodline, the last scion of which is Prince Kael'thas Sunstrider.