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词形变化：

动词过去式: nulled | 动词过去分词: nulled | 动词现在分词: nulling | 动词第三人称单数: nulls |

词义辨析：

同义:

a.没用的

ineffectual

inoperative

valueless

worthless

no-good

good-for-nothing

inconsequential

insignificant

trifling

trivial

piddling

immaterial

purposeless

unsubstantial

unavailing

futile

nugatory

useless

inutile

inefficacious

invalid

not binding

a.不存在的, 空的, 愚蠢的

nonexistent

inexistent

unprofitable

blank

empty

clear

bare

hollow

vacuous

senseless

inane

foolish

a.被根除的, 被删除的

annihilated

obliterated

destroyed

extinguished

exterminated

expunged

extirpated

dissolved

eliminated

effaced