adj. 25B6; adjective
a handy reference tool : USEFUL, convenient, practical, easy-to-use, well-designed, user-friendly, user-oriented, helpful, functional, serviceable.
keep your credit card handy : READILY AVAILABLE, available, at hand, to hand, near at hand, within reach, accessible, ready, close (by), near, nearby, at the ready, at one's fingertips; informal get-at-able.
he's handy with a needle : SKILFUL, skilled, dexterous, deft, nimble-fingered, adroit, able, adept, proficient, capable; good with one's hands; informal nifty.
inconvenient, inept.