lonely

As a verb neglect

is (label) to fail to care for or attend to something.

As a noun neglect

is the act of neglecting.

As an adjective lonely is

unhappy because of feelings of loneliness.

As adjectives the difference between lonely and concerned

is that lonely is unhappy because of feelings of loneliness while concerned is showing concern.

As a verb concerned is

(concern).

As an adjective lonely

is unhappy because of feelings of loneliness.

As a proper noun lively is

.

As adjectives the difference between lonely and shy

is that lonely is unhappy because of feelings of loneliness while shy is easily frightened; timid.

As a verb shy is

to avoid due to timidness or caution.

As a noun shy is

an act of throwing.

As a noun doubt

is uncertainty, disbelief.

As a verb doubt

is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As an adjective lonely is

unhappy because of feelings of loneliness.

As an adjective lonely

is unhappy because of feelings of loneliness.

As a noun isolation is

isolation (act of isolating).

As adjectives the difference between disconnected and lonely

is that disconnected is that is no longer connected while lonely is unhappy because of feelings of loneliness.

As a verb disconnected

is (disconnect).

As adjectives the difference between lonely and uncomfortable

is that lonely is unhappy because of feelings of loneliness while uncomfortable is not comfortable.

Lonely is a synonym of retired.

As adjectives the difference between lonely and retired

is that lonely is unhappy because of feelings of loneliness while retired is secluded from society (of a lifestyle, activity etc); private, quiet.

As a verb retired is

(retire).

Bleak is a related term of lonely.

As adjectives the difference between bleak and lonely

is that bleak is without color; pale; pallid while lonely is unhappy because of feelings of loneliness.

As a noun bleak

is a small european river fish (alburnus alburnus ), of the family cyprinidae.