1.Definition: causing fear or dread or terror
"A fearful howling"
2.Definition: experiencing or showing fear
"A fearful glance", "Fearful of criticism"
3.Definition: extremely distressing
"Fearful slum conditions"
4.Definition: lacking courage; ignobly timid and faint-hearted
5.Definition: timid by nature or revealing timidity
"Cast fearful glances at the large dog"