being alone, solitude, loneliness...

solitude, loneliness, isolation

isolation, being alone, being friendless

(romantic) love

orphan, person without friends

solitary island, isolated island

orphanage

aloof, proudly independent, standing apart...

fighting alone

lone traveller, lone traveler

lone (isolated) force, forlorn force

solitary castle, isolated castle

solitary sailboat

solitary light

solitary boat

lonely figure

profound loneliness, deep loneliness

isolated stronghold

being isolated, being separated, being cut off

young orphan, being alone and weak with no place to go to

solitary wild goose (i.e. separated from its flock, esp. flying)

sole sword, unarmed but for a sword

lone monkey, stray monkey

meal with family members eating separate foods, eating alone (without one's family), food sold in single servings

only extant copy, only existing copy

orphan

isolation

isolating language

isolation, sense of isolation, feeling of being isolated

sense of isolation, (feelings of) loneliness