ثَقِيل: ضِدّ خَفِيف heavy, weighty

ثَقِيل: مُرْهِق، مُزْعِج burdensome, onerous, oppressive, troublesome; hard to bear; unbearable; unpleasant, disagreeable, offensive; bothersome, vexing, annoying

ثَقِيل: بَلِيد، بَطِيء sluggish, dull, lumpish, lazy, indolent, slothful, slack, slow, heavy

ثَقِيل: هامّ weighty, momentous, grave, serious, important, significant

ثَقِيلُ الدّمِ أو الظّلّ أو الرّوح antipathetic, repugnant, repulsive, disgusting, disagreeable, unpleasant, unbearable, intolerable, insufferable; boring, dull, tiresome, wearisome, uninteresting; a bore

ثَقِيلُ السّمْع hard of hearing

ثَقِيلُ الفَهْم slow-witted, thick-witted, dull, doltish, obtuse, dense, silly, stupid

ثَقِيلُ الهَضْم indigestible, heavy

صِنَاعَةٌ ثَقِيلَة heavy industry

ماءٌ ثَقِيل heavy water