Englishundivided
adjective
they need the undivided attention of a sympathetic listener:
complete, full, total, whole, entire, out-and-out, absolute, unqualified, unadulterated, unalloyed, unreserved, unmitigated, unshared, unbroken, solid, consistent, thorough, concentrated, exclusive, dedicated, wholehearted, sincere, consummate;
undistracted, focused, engrossed, absorbed, attentive, committed.
▷antonyms divided, distracted.
undivided Oxford Dictionary of English