lonely, solitary
Je peux le dire maintenant, car ce soir je suis enfin solitaire.
I can say it now, because tonight I am finally alone.
— Les Ailes du désir (1987)
She looks lonely.
I am a lonely man.
Il est plutôt taciturne et solitaire.
He’s rather taciturn and solitary.
— Cemetery of Splendour (2015)
You are very solitary.