Choose the word that denotes one that is in a war -like mood:

The correct option is Belligerent.

Let us break down the meaning of the given options to understand why "Belligerent" is the correct word:
1. Belligerent: This word originates from the Latin words bellum (meaning "war") and gerere (meaning "to wage" or "to carry"). Therefore, a belligerent person or nation is one that is hostile, aggressive, or engaged in a war-like mood.
2. Veteran: This refers to a person who has had long experience in a particular field, especially someone who has served in the military.
3. Virtuoso: This refers to a person who is highly skilled in music or another artistic pursuit.
4. Bohemian: This refers to a socially unconventional person, especially one who is involved in the arts.

Thus, the word that specifically denotes someone in a war-like mood is Belligerent.