Antonyms for fluent

articulate:

hesitant, unprepared, effortful, unfluent, inarticulate, quiet.

noun:

glutinous, clotted, murderous, muttering, stumbling, problematic, involved, tough, formidable, oppressive, intricate, solid, gooey, strenuous, complex, stiff, knotty, exacting, unvocal, difficult, severe, Toilful, tongueless, stuttering, arduous, viscous, mumbling, halting, exhausting, recondite, sputtering, jelled, gummy, taxing, jellied, awkward, coagulated, abstruse, Ineloquent, burdensome, herculean, thick, onerous, laborious, painful, grueling, hard, labored, hesitant, maundering, stressful, stammering, gelatinous, gelled, rough, gluey, faltering, demanding, complicated, troublesome, unarticulate, tongue-tied, toilsome.