Bối rối, lúng túng, ngượng

the boy looks confused when he sees his parents at the door of his classroom

thằng bé có vẻ bối rối khi thấy bố mẹ nó ở cửa phòng học

lẫn lộn

Mixed up, jumbled, disordered, disorganized, disorderly,muddled, muddle-headed, snarled (up), messy, baffling,confusing, mystifying, puzzling, perplexing; contradictory,ambiguous, misleading, inconsistent, mixed up, botched (up) ,Colloq higgledy-piggledy: The accountants have provided aconfused set of figures.

Bewildered, perplexed, puzzled,baffled, (be)fuddled, mystified, disoriented, discomposed, atsea, flummoxed, dazed, muddled, bemused, mixed up, nonplussed,disconcerted, abashed, put off, put out, disturbed, flustered,ill at ease, upset, at sixes and sevens, at a loss, Raremetagrobolized, Colloq screwed-up, muzzy, out of it, not withit, Chiefly US discombobulated, fouled up; Slang (all) balledup, Brit (all) bollocksed or ballocksed (up), US (all) bollixed(up), US and Canadian snafu: I have never seen anyone soconfused about a simple question of astrophysics. 3 jumbled,mixed up, muddled, disorderly, confusing, messy, disorganized,topsy-turvy; miscellaneous, motley, Brit shambolic: The bookslay in a confused heap on the floor.