Definitions
1.adjectiveUnable to walk properly because of a problem with one's feet or legs.
2.adjectiveMoving with pain or difficulty on account of injury, defect or temporary obstruction of a function."a lame leg, arm or muscle"
3.adjective(by extension) Hobbling; limping; inefficient; imperfect.
4.adjectiveUnconvincing or unbelievable."He had a really lame excuse for missing the birthday party."
5.adjectiveFailing to be cool, funny, interesting or relevant."He kept telling these extremely lame jokes all night."
6.nounA person lacking in maturity, social skills, technical competence or intelligence