Antonyms of adj fickle

2 senses of fickle

Sense 1
fickle, volatile -- (marked by erratic changeableness in affections or attachments; "fickle friends"; "a flirt's volatile affections")

INDIRECT (VIA inconstant) -> constant -- (steadfast in purpose or devotion or affection; "a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star")

Sense 2
erratic, fickle, mercurial, quicksilver (prenominal) -- (liable to sudden unpredictable change; "erratic behavior"; "fickle weather"; "mercurial twists of temperament"; "a quicksilver character, cool and willful at one moment, utterly fragile the next")

INDIRECT (VIA changeable) -> unchangeable -- (not changeable or subject to change; "a fixed and unchangeable part of the germ plasm"-Ashley Montagu; "the unchangeable seasons"; "one of the unchangeable facts of life")

Similarity of adj fickle

2 senses of fickle

Sense 1
fickle, volatile -- (marked by erratic changeableness in affections or attachments; "fickle friends"; "a flirt's volatile affections")
       => inconstant (vs. constant) -- (likely to change frequently often without apparent or cogent reason; variable; "inconstant affections"; "an inconstant lover"; "swear not by...the inconstant moon"- Shakespeare)

Sense 2
erratic, fickle, mercurial, quicksilver (prenominal) -- (liable to sudden unpredictable change; "erratic behavior"; "fickle weather"; "mercurial twists of temperament"; "a quicksilver character, cool and willful at one moment, utterly fragile the next")
       => changeable (vs. unchangeable), changeful -- (such that alteration is possible; having a marked tendency to change; "changeable behavior"; "changeable moods"; "changeable prices")