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dull
How to sign: slow to learn or understand; lacking intellectual acuity "so dense he never understands anything I say to him"; "never met anyone quite so dim"; "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray; "dumb officials mak;
dumb in ASLWatch how to sign dumb in American Sign Language
How to sign: so lacking in interest as to cause mental weariness "a boring evening with uninteresting people"; "the deadening effect of some routine tasks"; "a dull play"; "his competent but dull performance"; "a ho-hum speaker who couldn't capture their attention";
boring in ASLWatch how to sign boring in American Sign Language