wavelike motions; a series of wavelike bends, curves, or elevations

urgently necessary

unable to perceive with the senses; cannot be touched or grasped

in a commanding way that does not allow for refusal or contradiction

fear and worry for the future; hesitation based on fear or expectations

a large destructive fire

to inflict a heavy blow

involving guesswork; based on theory or hypothesis instead of facts

keenly distressing to the feelings; or deeply and/or emotionally moving