able

Synonyms: adept adequate adroit agile alert apt bright capable competent cunning deft dexterous easy effortless endowed equipped facile fitted good intelligent knowing powerful ready smart strong worthy

Antonyms: ineffective inept infirm powerless unable useless

Synonyms: accomplished adroit agile artful au fait brilliant capable clever deft dexterous effective effectual efficient equal to experienced expert facile gifted ingenious intelligent keen know backwards and forwards know one’s onions know the ropes learned masterful masterly powerful practiced prepared proficient qualified responsible savvy sharp skilled skillful smart talented there trained up to it up to snuff up to speed with it

Antonyms: delicate feeble inept stupid weak