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In Icelandic, this adjective is said “velkomin” in a neutral plural or in the feminine singular. But, because of the terrible declensions if it is referred in masculine singular, then an -n is added: velkominn.
Examples:
Þú ert alltaf velkomin(n) You are always welcome.
Velkomin(n) heim! Welcome home!
Velkomin(n) aftur! Welcome back!