(usu in passive) to disturb (somebody) greatly in mind
to throw (something) into confusion or disorder
to cause (a moving object, celestial body, etc) to deviate from a theoretically regular motion such as a regular path of orbit
perturbable adj
perturbation /puhtəʹbaysh(ə)n/ noun
perturbational /puhtəʹbaysh(ə)nl/ adj
perturbed adj
perturbing adj
perturbingly adv
[Middle English perturben via French from Latin perturbare to throw into confusion, from per- + turbare to disturb]