in ‧ ge ‧ ni ‧ ous /ɪnˈdʒiːniəs/ BrE AmE adjective
[ Date: 1400-1500 ; Language: French ; Origin: ingénieux , from Latin ingenium 'natural ability' ]
1 . an ingenious plan, idea, or object works well and is the result of clever thinking and new ideas:
Many fish have ingenious ways of protecting their eggs from predators.
an ingenious device
2 . someone who is ingenious is very good at inventing things or at thinking of new ideas
—ingeniously adverb