unequal

Concise Oxford English Dictionary © 2008 Oxford University Press:
unequal/ʌnˈiːkwəl/

▶adjective

• 1 not equal in quantity, size, or value.

  ■ not fair, evenly balanced, or having equal advantage.

• 2 (unequal to) not having the ability or resources to meet (a challenge).

– derivatives
unequalize (or unequalise) verb,
unequally adverb.