Word Study
regretful
OXFORD DICTIONARY
regretful, adj. feeling or showing regret.
Derivative
regretfully adv. regretfulness n.
THESAURUS
regretful
apologetic, ashamed, baffled, balked, betrayed, bilked, blasted, blighted, chapfallen, conscience-smitten, conscience-stricken, contrite, crestfallen, crossed, crushed, dashed, defeated, disappointed, dished, disillusioned, dissatisfied, foiled, frustrated, full of remorse, guilty, ill done-by, ill-served, let down, mournful, out of countenance, penitent, remorseful, repentant, repining, rueful, sad, self-accusing, self-condemning, self-convicting, self-debasing, self-flagellating, self-humiliating, self-punishing, self-reproaching, shamefaced, shamefast, shameful, sorely disappointed, sorrowful, sorry, soured, thwarted, unhappy about, wistfulROGET THESAURUS
regretful
Discontent
N discontent, discontentment, dissatisfaction, dissent, disappointment, mortification, cold comfort, regret, repining, taking on, heart-burning, heart-grief, querulousness, hypercriticism, inquietude, vexation of spirit, soreness, worry, concern, fear, malcontent, grumbler, growler, croaker, dissident, dissenter, laudator temporis acti, censurer, complainer, fault-finder, murmerer, cave of Adullam, indignation meeting, winter of our discontent, with what I most enjoy contented least, discontented, dissatisfied, unsatisfied, ungratified, dissident, dissentient, malcontent, malcontented, exigent, exacting, hypercritical, repining, regretful, down in the mouth, in high dudgeon, in a fume, in the sulks, in the dumps, in bad humor, glum, sulky, sour as a crab, soured, sore, out of humor, out of temper, disappointing, unsatisfactory, frustrated (failure), Int, so much the worse!, that won't do, that will never do, it will never do, curtae nescio quid semper abest rei, ne Jupiter Quidem omnibus placet, poor in abundance, famished at a feast.Regret
N regret, repining, homesickness, nostalgia, mal du pays, maladie, lamentation, penitence, bitterness, heartburning, recrimination (accusation), laudator temporis acti, regretting, regretful, homesick, regretted, much to be regretted, regrettable, lamentable, regrettably, unfortunately, most unfortunately, Int, alas!, what a pity!, hang it!, 'tis pity, 'tis too true, sigh'd and look'd and sigh'd again, I'm sorry.For further exploring for "regretful" in Webster Dictionary Online