cumbrous

cum⋅brous --- [kuhm-bruhs]

–adjective
Difficult to handle or use especially because of size or weight

The cumbrous door blocking their way was a thick wall of riveted iron.

Inadvertent

in⋅ad⋅vert⋅ent --- [in-uhd-vur-tnt]

–adjective

1.	unintentional: an inadvertent insult.

2.	not attentive; heedless.

3.	of, pertaining to, or characterized by lack of attention.

Related forms:

in⋅ad⋅vert⋅ent⋅ly, adverb

Synonyms:
2. inattentive. 3. thoughtless, careless, negligent.

Related Words for : inadvertently

unknowingly, unwittingly

Excrutiate

ex⋅cru⋅ci⋅ate--- [ik-skroo-shee-eyt]

–verb (used with object), -at⋅ed, -at⋅ing.

1.	to inflict severe pain upon; torture: The headache excruciated him.

2.	to cause mental anguish to; irritate greatly.

Word Origin & History

excruciate

1570, from L. excruciatus, pp. of excruciare "to torture, torment," from ex- "out, thoroughly" + cruciare "cause pain or anguish to," lit. "crucify," from crux (gen. crucis) "cross."

Eg. Max tried to have faith, but the pain was excruciating [Ref: Angels and Daemons ]

Exacerbate

ex-ac-er-bate  -
–verb (used with object), -bat-ed, -bat-ing.
1.
to increase the severity, bitterness, or violence of (disease, ill feeling, etc.); aggravate.
2.
to embitter the feelings of (a person); irritate; exasperate.
Origin: 1650–60; < style="FONT-VARIANT: small-caps" href="http://dictionary.reference.com/search?q=ex-&db=luna">ex- 1 + acerbātus acerbate Related forms:
ex-ac-er-bat-ing-ly, adverb
ex-ac-er-ba-tion, noun
Synonyms:1. intensify, inflame, worsen.
Antonyms:1. relieve, soothe, alleviate.