solitary
Bored Lonely
Depressed?
The opposite is together, in a group, or en masse.
alone, left, sorrowful, forgotten ect.
Another word for sad is "sorrowful," while a synonym for lonely is "isolated." Both terms convey feelings of discomfort or emotional pain associated with a lack of connection or joy. Other options include "melancholy" for sad and "desolate" for lonely.
A word that has the same meaning as another word is a synonym.
Single, Evaded, Lapsed From thesarus.com
The word sought is "solitary."
Another word meaning clenched is tighten.
The meaning of a word is its "definition."
A synonym is a word with a meaning similar to that of another word.
Another word meaning "to influence" is "affect" or "impact."