inconstant
/ɪnˈkɒnstənt/adjective
1- frequently changing; variable or irregular频繁变化的; 易变的; 无规律的：
their exact dimensions aren't easily measured since they are inconstant.
它们的确切尺寸不易测量, 因为它们变化频繁。
1.1
- (of a person or their behaviour) not faithful and dependable（人, 行为）不忠实的, 不可靠的。
派生词
inconstancy
noun （pl. -ies）inconstantly
adverb词源
late Middle English: via Old French from Latin inconstant-, from in- 'not' + constant- 'standing firm' （see CONSTANT）.