Not to be relied upon
capricious, whimsical, mercurial; see changeable 1, 2.
Unfaithful in love
faithless, inconstant, coquettish, flirtatious, flighty, untrue; see also flirtatious.
Antonyms faithful*, loving, true. See syn. study at inconstant.inconstant.
Following no predictable pattern:
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