diagonally
adverb
[ dʌɪˈaɡ(ə)nəli ]
• in a diagonal direction.
• "now walk diagonally across the field towards a farmhouse"
Similar:
obliquely,
at an angle,
crossways,
crosswise,
on the cross,
on the slant,
slantwise,
aslant,
cornerwise,
on the bias,
cater-cornered,
cater-corner,
catty-cornered,
kitty-corner,