Resistant to deformation or flow.
Having sufficient skill, knowledge, ability, or qualifications.
Having jurisdiction or authority over a particular issue or question.
Adequate for the purpose.
Permeable to foreign DNA.
Unable to do well at a particular task or thing. Useless is mildly insulting.
Without use or possibility to be used.
Good-for-nothing; not dependable.
Unhelpful, not useful; pointless (of an action).