  We prove new upper bounds for the sup-norm of Hecke Maa{\ss} newforms on
$GL(2)$ over a number field. Our newforms are more general than those
considered in a recent paper by Blomer, Harcos, Maga, and Mili\`cevi\`c: we do
not require square free level. Furthermore, we allow for non-trivial central
character. Over the rationals we cover the best bounds as obtained by Saha.
