The ancient phrase 'kongtong' means dim and untaught.
Tips
usage
First tone 倥 is bound to the literary word 倥侗 (ignorant, unenlightened). A separate reading 倥 carries the unrelated 'pressed for time, harried' sense in 倥偬.
Right is 空, giving the sound kōng and a fitting overtone: an empty, unfilled head. Person plus emptiness suggests an unenlightened, knowledge-less mind.